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Finding the Fourth Proportional to 87.72, 131.48 and 33.56

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Solution

The fourth proportional to 87.72, 131.48 and 33.56 is: 50.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.72 : 131.48 = 33.56 : x
  2. Step 2: Convert to fraction form
    87.72/131.48 = 33.56/x
  3. Step 3: Cross multiply
    87.72x = 131.48 × 33.56
  4. Step 4: Simplify right side
    87.72x = 4,412.47
  5. Step 5: Solve for x
    x = 4,412.47/87.72
  6. Step 6: Final answer
    x = 50.30

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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.