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Finding the Fourth Proportional to 129,089.52, 178,143.12 and 71,728.62

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Solution

The fourth proportional to 129,089.52, 178,143.12 and 71,728.62 is: 98,985.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,089.52 : 178,143.12 = 71,728.62 : x
  2. Step 2: Convert to fraction form
    129,089.52/178,143.12 = 71,728.62/x
  3. Step 3: Cross multiply
    129,089.52x = 178,143.12 × 71,728.62
  4. Step 4: Simplify right side
    129,089.52x = 12,777,959,801.45
  5. Step 5: Solve for x
    x = 12,777,959,801.45/129,089.52
  6. Step 6: Final answer
    x = 98,985.26

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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.