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Finding the Fourth Proportional to 87.02, 119.82 and 73.92

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Solution

The fourth proportional to 87.02, 119.82 and 73.92 is: 101.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.02 : 119.82 = 73.92 : x
  2. Step 2: Convert to fraction form
    87.02/119.82 = 73.92/x
  3. Step 3: Cross multiply
    87.02x = 119.82 × 73.92
  4. Step 4: Simplify right side
    87.02x = 8,857.09
  5. Step 5: Solve for x
    x = 8,857.09/87.02
  6. Step 6: Final answer
    x = 101.79

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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.