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Finding the Fourth Proportional to 129,371.58, 178,522.92 and 72,772.02

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Solution

The fourth proportional to 129,371.58, 178,522.92 and 72,772.02 is: 100,419.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,371.58 : 178,522.92 = 72,772.02 : x
  2. Step 2: Convert to fraction form
    129,371.58/178,522.92 = 72,772.02/x
  3. Step 3: Cross multiply
    129,371.58x = 178,522.92 × 72,772.02
  4. Step 4: Simplify right side
    129,371.58x = 12,991,473,504.70
  5. Step 5: Solve for x
    x = 12,991,473,504.70/129,371.58
  6. Step 6: Final answer
    x = 100,419.84

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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.