Home / 129,080.16-178,129.92-72,491.52

Finding the Fourth Proportional to 129,080.16, 178,129.92 and 72,491.52

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Solution

The fourth proportional to 129,080.16, 178,129.92 and 72,491.52 is: 100,037.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,080.16 : 178,129.92 = 72,491.52 : x
  2. Step 2: Convert to fraction form
    129,080.16/178,129.92 = 72,491.52/x
  3. Step 3: Cross multiply
    129,080.16x = 178,129.92 × 72,491.52
  4. Step 4: Simplify right side
    129,080.16x = 12,912,908,658.28
  5. Step 5: Solve for x
    x = 12,912,908,658.28/129,080.16
  6. Step 6: Final answer
    x = 100,037.90

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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.