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Finding the Fourth Proportional to 129,882.48, 194,739.72 and 85,374.29

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Solution

The fourth proportional to 129,882.48, 194,739.72 and 85,374.29 is: 128,006.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,882.48 : 194,739.72 = 85,374.29 : x
  2. Step 2: Convert to fraction form
    129,882.48/194,739.72 = 85,374.29/x
  3. Step 3: Cross multiply
    129,882.48x = 194,739.72 × 85,374.29
  4. Step 4: Simplify right side
    129,882.48x = 16,625,765,329.80
  5. Step 5: Solve for x
    x = 16,625,765,329.80/129,882.48
  6. Step 6: Final answer
    x = 128,006.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.