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Finding the Fourth Proportional to 87.85, 131.75 and 39.07

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Solution

The fourth proportional to 87.85, 131.75 and 39.07 is: 58.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.85 : 131.75 = 39.07 : x
  2. Step 2: Convert to fraction form
    87.85/131.75 = 39.07/x
  3. Step 3: Cross multiply
    87.85x = 131.75 × 39.07
  4. Step 4: Simplify right side
    87.85x = 5,147.59
  5. Step 5: Solve for x
    x = 5,147.59/87.85
  6. Step 6: Final answer
    x = 58.59

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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.