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Finding the Fourth Proportional to 129,508.52, 178,726.62 and 71,367.72

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Solution

The fourth proportional to 129,508.52, 178,726.62 and 71,367.72 is: 98,490.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,508.52 : 178,726.62 = 71,367.72 : x
  2. Step 2: Convert to fraction form
    129,508.52/178,726.62 = 71,367.72/x
  3. Step 3: Cross multiply
    129,508.52x = 178,726.62 × 71,367.72
  4. Step 4: Simplify right side
    129,508.52x = 12,755,311,372.71
  5. Step 5: Solve for x
    x = 12,755,311,372.71/129,508.52
  6. Step 6: Final answer
    x = 98,490.13

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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.