Home / 129,402.52-178,578.18-72,813.88

Finding the Fourth Proportional to 129,402.52, 178,578.18 and 72,813.88

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Solution

The fourth proportional to 129,402.52, 178,578.18 and 72,813.88 is: 100,484.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,402.52 : 178,578.18 = 72,813.88 : x
  2. Step 2: Convert to fraction form
    129,402.52/178,578.18 = 72,813.88/x
  3. Step 3: Cross multiply
    129,402.52x = 178,578.18 × 72,813.88
  4. Step 4: Simplify right side
    129,402.52x = 13,002,970,169.14
  5. Step 5: Solve for x
    x = 13,002,970,169.14/129,402.52
  6. Step 6: Final answer
    x = 100,484.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.