Home / 129,139.56-178,221.84-72,550.92

Finding the Fourth Proportional to 129,139.56, 178,221.84 and 72,550.92

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Solution

The fourth proportional to 129,139.56, 178,221.84 and 72,550.92 is: 100,125.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,139.56 : 178,221.84 = 72,550.92 : x
  2. Step 2: Convert to fraction form
    129,139.56/178,221.84 = 72,550.92/x
  3. Step 3: Cross multiply
    129,139.56x = 178,221.84 × 72,550.92
  4. Step 4: Simplify right side
    129,139.56x = 12,930,158,456.09
  5. Step 5: Solve for x
    x = 12,930,158,456.09/129,139.56
  6. Step 6: Final answer
    x = 100,125.46

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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.