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Finding the Fourth Proportional to 664,615.90, 996,923.85 and 221,383.90

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Solution

The fourth proportional to 664,615.90, 996,923.85 and 221,383.90 is: 332,075.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,615.90 : 996,923.85 = 221,383.90 : x
  2. Step 2: Convert to fraction form
    664,615.90/996,923.85 = 221,383.90/x
  3. Step 3: Cross multiply
    664,615.90x = 996,923.85 × 221,383.90
  4. Step 4: Simplify right side
    664,615.90x = 220,702,889,916.02
  5. Step 5: Solve for x
    x = 220,702,889,916.02/664,615.90
  6. Step 6: Final answer
    x = 332,075.85

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Half scale
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Double scale
Find fourth proportional to 664,616.90, 996,925.35 and 221,384.90
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.