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Finding the Fourth Proportional to 261,127.79, 391,691.69 and 172,360.53

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Solution

The fourth proportional to 261,127.79, 391,691.69 and 172,360.53 is: 258,540.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,127.79 : 391,691.69 = 172,360.53 : x
  2. Step 2: Convert to fraction form
    261,127.79/391,691.69 = 172,360.53/x
  3. Step 3: Cross multiply
    261,127.79x = 391,691.69 × 172,360.53
  4. Step 4: Simplify right side
    261,127.79x = 67,512,187,285.00
  5. Step 5: Solve for x
    x = 67,512,187,285.00/261,127.79
  6. Step 6: Final answer
    x = 258,540.80

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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.