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Finding the Fourth Proportional to 87.32, 130.97 and 78.41

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Solution

The fourth proportional to 87.32, 130.97 and 78.41 is: 117.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.32 : 130.97 = 78.41 : x
  2. Step 2: Convert to fraction form
    87.32/130.97 = 78.41/x
  3. Step 3: Cross multiply
    87.32x = 130.97 × 78.41
  4. Step 4: Simplify right side
    87.32x = 10,269.36
  5. Step 5: Solve for x
    x = 10,269.36/87.32
  6. Step 6: Final answer
    x = 117.61

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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.