Home / 129,499.18-178,717.10-78,516.79

Finding the Fourth Proportional to 129,499.18, 178,717.10 and 78,516.79

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Solution

The fourth proportional to 129,499.18, 178,717.10 and 78,516.79 is: 108,358.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,499.18 : 178,717.10 = 78,516.79 : x
  2. Step 2: Convert to fraction form
    129,499.18/178,717.10 = 78,516.79/x
  3. Step 3: Cross multiply
    129,499.18x = 178,717.10 × 78,516.79
  4. Step 4: Simplify right side
    129,499.18x = 14,032,292,170.73
  5. Step 5: Solve for x
    x = 14,032,292,170.73/129,499.18
  6. Step 6: Final answer
    x = 108,358.16

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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.