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Finding the Fourth Proportional to 129,377.66, 178,540.88 and 72,789.03

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Solution

The fourth proportional to 129,377.66, 178,540.88 and 72,789.03 is: 100,448.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,377.66 : 178,540.88 = 72,789.03 : x
  2. Step 2: Convert to fraction form
    129,377.66/178,540.88 = 72,789.03/x
  3. Step 3: Cross multiply
    129,377.66x = 178,540.88 × 72,789.03
  4. Step 4: Simplify right side
    129,377.66x = 12,995,817,106.60
  5. Step 5: Solve for x
    x = 12,995,817,106.60/129,377.66
  6. Step 6: Final answer
    x = 100,448.70

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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.