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Finding the Fourth Proportional to 129,538.01, 178,759.76 and 72,177.10

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Solution

The fourth proportional to 129,538.01, 178,759.76 and 72,177.10 is: 99,602.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,538.01 : 178,759.76 = 72,177.10 : x
  2. Step 2: Convert to fraction form
    129,538.01/178,759.76 = 72,177.10/x
  3. Step 3: Cross multiply
    129,538.01x = 178,759.76 × 72,177.10
  4. Step 4: Simplify right side
    129,538.01x = 12,902,361,174.47
  5. Step 5: Solve for x
    x = 12,902,361,174.47/129,538.01
  6. Step 6: Final answer
    x = 99,602.90

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.