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Finding the Fourth Proportional to 129,525.92, 178,755 and 72,170

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Solution

The fourth proportional to 129,525.92, 178,755 and 72,170 is: 99,599.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,525.92 : 178,755 = 72,170 : x
  2. Step 2: Convert to fraction form
    129,525.92/178,755 = 72,170/x
  3. Step 3: Cross multiply
    129,525.92x = 178,755 × 72,170
  4. Step 4: Simplify right side
    129,525.92x = 12,900,748,350
  5. Step 5: Solve for x
    x = 12,900,748,350/129,525.92
  6. Step 6: Final answer
    x = 99,599.74

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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.