Home / 129,358.13-178,514.17-72,769.50

Finding the Fourth Proportional to 129,358.13, 178,514.17 and 72,769.50

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Solution

The fourth proportional to 129,358.13, 178,514.17 and 72,769.50 is: 100,421.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,358.13 : 178,514.17 = 72,769.50 : x
  2. Step 2: Convert to fraction form
    129,358.13/178,514.17 = 72,769.50/x
  3. Step 3: Cross multiply
    129,358.13x = 178,514.17 × 72,769.50
  4. Step 4: Simplify right side
    129,358.13x = 12,990,386,893.82
  5. Step 5: Solve for x
    x = 12,990,386,893.82/129,358.13
  6. Step 6: Final answer
    x = 100,421.88

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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.