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Finding the Fourth Proportional to 129,079.52, 178,052.50 and 81,249.80

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Solution

The fourth proportional to 129,079.52, 178,052.50 and 81,249.80 is: 112,076.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,079.52 : 178,052.50 = 81,249.80 : x
  2. Step 2: Convert to fraction form
    129,079.52/178,052.50 = 81,249.80/x
  3. Step 3: Cross multiply
    129,079.52x = 178,052.50 × 81,249.80
  4. Step 4: Simplify right side
    129,079.52x = 14,466,730,014.50
  5. Step 5: Solve for x
    x = 14,466,730,014.50/129,079.52
  6. Step 6: Final answer
    x = 112,076.11

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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.