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Finding the Fourth Proportional to 261,998.20, 392,997.30 and 72,458.20

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Solution

The fourth proportional to 261,998.20, 392,997.30 and 72,458.20 is: 108,687.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,998.20 : 392,997.30 = 72,458.20 : x
  2. Step 2: Convert to fraction form
    261,998.20/392,997.30 = 72,458.20/x
  3. Step 3: Cross multiply
    261,998.20x = 392,997.30 × 72,458.20
  4. Step 4: Simplify right side
    261,998.20x = 28,475,876,962.86
  5. Step 5: Solve for x
    x = 28,475,876,962.86/261,998.20
  6. Step 6: Final answer
    x = 108,687.30

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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.