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Finding the Fourth Proportional to 261,129.40, 391,694.10 and 74,116.60

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Solution

The fourth proportional to 261,129.40, 391,694.10 and 74,116.60 is: 111,174.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,129.40 : 391,694.10 = 74,116.60 : x
  2. Step 2: Convert to fraction form
    261,129.40/391,694.10 = 74,116.60/x
  3. Step 3: Cross multiply
    261,129.40x = 391,694.10 × 74,116.60
  4. Step 4: Simplify right side
    261,129.40x = 29,031,034,932.06
  5. Step 5: Solve for x
    x = 29,031,034,932.06/261,129.40
  6. Step 6: Final answer
    x = 111,174.90

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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.