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Finding the Fourth Proportional to 664,642.90, 996,964.35 and 221,410.90

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Solution

The fourth proportional to 664,642.90, 996,964.35 and 221,410.90 is: 332,116.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,642.90 : 996,964.35 = 221,410.90 : x
  2. Step 2: Convert to fraction form
    664,642.90/996,964.35 = 221,410.90/x
  3. Step 3: Cross multiply
    664,642.90x = 996,964.35 × 221,410.90
  4. Step 4: Simplify right side
    664,642.90x = 220,738,774,001.42
  5. Step 5: Solve for x
    x = 220,738,774,001.42/664,642.90
  6. Step 6: Final answer
    x = 332,116.35

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Half scale
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Double scale
Find fourth proportional to 664,643.90, 996,965.85 and 221,411.90
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.