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Finding the Fourth Proportional to 393,909.90, 591,010.65 and 127,679.10

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Solution

The fourth proportional to 393,909.90, 591,010.65 and 127,679.10 is: 191,565.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,909.90 : 591,010.65 = 127,679.10 : x
  2. Step 2: Convert to fraction form
    393,909.90/591,010.65 = 127,679.10/x
  3. Step 3: Cross multiply
    393,909.90x = 591,010.65 × 127,679.10
  4. Step 4: Simplify right side
    393,909.90x = 75,459,707,882.42
  5. Step 5: Solve for x
    x = 75,459,707,882.42/393,909.90
  6. Step 6: Final answer
    x = 191,565.91

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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.