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Finding the Fourth Proportional to 87.31, 120.47 and 50.46

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Solution

The fourth proportional to 87.31, 120.47 and 50.46 is: 69.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.31 : 120.47 = 50.46 : x
  2. Step 2: Convert to fraction form
    87.31/120.47 = 50.46/x
  3. Step 3: Cross multiply
    87.31x = 120.47 × 50.46
  4. Step 4: Simplify right side
    87.31x = 6,078.92
  5. Step 5: Solve for x
    x = 6,078.92/87.31
  6. Step 6: Final answer
    x = 69.62

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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.