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Finding the Fourth Proportional to 129,609.78, 178,861.73 and 75,884.10

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Solution

The fourth proportional to 129,609.78, 178,861.73 and 75,884.10 is: 104,720.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,609.78 : 178,861.73 = 75,884.10 : x
  2. Step 2: Convert to fraction form
    129,609.78/178,861.73 = 75,884.10/x
  3. Step 3: Cross multiply
    129,609.78x = 178,861.73 × 75,884.10
  4. Step 4: Simplify right side
    129,609.78x = 13,572,761,405.49
  5. Step 5: Solve for x
    x = 13,572,761,405.49/129,609.78
  6. Step 6: Final answer
    x = 104,720.19

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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.