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Finding the Fourth Proportional to 129,376.72, 178,539.87 and 72,788.09

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Solution

The fourth proportional to 129,376.72, 178,539.87 and 72,788.09 is: 100,447.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,376.72 : 178,539.87 = 72,788.09 : x
  2. Step 2: Convert to fraction form
    129,376.72/178,539.87 = 72,788.09/x
  3. Step 3: Cross multiply
    129,376.72x = 178,539.87 × 72,788.09
  4. Step 4: Simplify right side
    129,376.72x = 12,995,576,126.15
  5. Step 5: Solve for x
    x = 12,995,576,126.15/129,376.72
  6. Step 6: Final answer
    x = 100,447.56

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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.