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Finding the Fourth Proportional to 87.32, 120.44 and 68.87

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Solution

The fourth proportional to 87.32, 120.44 and 68.87 is: 94.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.32 : 120.44 = 68.87 : x
  2. Step 2: Convert to fraction form
    87.32/120.44 = 68.87/x
  3. Step 3: Cross multiply
    87.32x = 120.44 × 68.87
  4. Step 4: Simplify right side
    87.32x = 8,294.01
  5. Step 5: Solve for x
    x = 8,294.01/87.32
  6. Step 6: Final answer
    x = 94.98

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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.