Home / 129,143.91-178,217.42-71,781.76

Finding the Fourth Proportional to 129,143.91, 178,217.42 and 71,781.76

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Solution

The fourth proportional to 129,143.91, 178,217.42 and 71,781.76 is: 99,058.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,143.91 : 178,217.42 = 71,781.76 : x
  2. Step 2: Convert to fraction form
    129,143.91/178,217.42 = 71,781.76/x
  3. Step 3: Cross multiply
    129,143.91x = 178,217.42 × 71,781.76
  4. Step 4: Simplify right side
    129,143.91x = 12,792,760,070.26
  5. Step 5: Solve for x
    x = 12,792,760,070.26/129,143.91
  6. Step 6: Final answer
    x = 99,058.18

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1.5x scale

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.