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Finding the Fourth Proportional to 169,218.72, 253,711.44 and 80,397.36

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Solution

The fourth proportional to 169,218.72, 253,711.44 and 80,397.36 is: 120,540.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,218.72 : 253,711.44 = 80,397.36 : x
  2. Step 2: Convert to fraction form
    169,218.72/253,711.44 = 80,397.36/x
  3. Step 3: Cross multiply
    169,218.72x = 253,711.44 × 80,397.36
  4. Step 4: Simplify right side
    169,218.72x = 20,397,729,977.80
  5. Step 5: Solve for x
    x = 20,397,729,977.80/169,218.72
  6. Step 6: Final answer
    x = 120,540.62

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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.