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Finding the Fourth Proportional to 87.32, 130.90 and 33.18

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Solution

The fourth proportional to 87.32, 130.90 and 33.18 is: 49.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.32 : 130.90 = 33.18 : x
  2. Step 2: Convert to fraction form
    87.32/130.90 = 33.18/x
  3. Step 3: Cross multiply
    87.32x = 130.90 × 33.18
  4. Step 4: Simplify right side
    87.32x = 4,343.26
  5. Step 5: Solve for x
    x = 4,343.26/87.32
  6. Step 6: Final answer
    x = 49.74

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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.