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Finding the Fourth Proportional to 129,367.78, 178,462.20 and 75,617.68

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Solution

The fourth proportional to 129,367.78, 178,462.20 and 75,617.68 is: 104,314.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,367.78 : 178,462.20 = 75,617.68 : x
  2. Step 2: Convert to fraction form
    129,367.78/178,462.20 = 75,617.68/x
  3. Step 3: Cross multiply
    129,367.78x = 178,462.20 × 75,617.68
  4. Step 4: Simplify right side
    129,367.78x = 13,494,897,531.70
  5. Step 5: Solve for x
    x = 13,494,897,531.70/129,367.78
  6. Step 6: Final answer
    x = 104,314.21

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1.5x scale

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.