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Finding the Fourth Proportional to 129,340.80, 178,491.78 and 72,751.68

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Solution

The fourth proportional to 129,340.80, 178,491.78 and 72,751.68 is: 100,398.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,340.80 : 178,491.78 = 72,751.68 : x
  2. Step 2: Convert to fraction form
    129,340.80/178,491.78 = 72,751.68/x
  3. Step 3: Cross multiply
    129,340.80x = 178,491.78 × 72,751.68
  4. Step 4: Simplify right side
    129,340.80x = 12,985,576,861.19
  5. Step 5: Solve for x
    x = 12,985,576,861.19/129,340.80
  6. Step 6: Final answer
    x = 100,398.15

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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.