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Finding the Fourth Proportional to 87.13, 120.21 and 62.26

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Solution

The fourth proportional to 87.13, 120.21 and 62.26 is: 85.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.13 : 120.21 = 62.26 : x
  2. Step 2: Convert to fraction form
    87.13/120.21 = 62.26/x
  3. Step 3: Cross multiply
    87.13x = 120.21 × 62.26
  4. Step 4: Simplify right side
    87.13x = 7,484.27
  5. Step 5: Solve for x
    x = 7,484.27/87.13
  6. Step 6: Final answer
    x = 85.90

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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.