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Finding the Fourth Proportional to 664,311.90, 996,467.85 and 646,815.90

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Solution

The fourth proportional to 664,311.90, 996,467.85 and 646,815.90 is: 970,223.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,311.90 : 996,467.85 = 646,815.90 : x
  2. Step 2: Convert to fraction form
    664,311.90/996,467.85 = 646,815.90/x
  3. Step 3: Cross multiply
    664,311.90x = 996,467.85 × 646,815.90
  4. Step 4: Simplify right side
    664,311.90x = 644,531,249,218.82
  5. Step 5: Solve for x
    x = 644,531,249,218.82/664,311.90
  6. Step 6: Final answer
    x = 970,223.85

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Double scale
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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.