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Finding the Fourth Proportional to 87.16, 120.14 and 61.89

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Solution

The fourth proportional to 87.16, 120.14 and 61.89 is: 85.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.16 : 120.14 = 61.89 : x
  2. Step 2: Convert to fraction form
    87.16/120.14 = 61.89/x
  3. Step 3: Cross multiply
    87.16x = 120.14 × 61.89
  4. Step 4: Simplify right side
    87.16x = 7,435.27
  5. Step 5: Solve for x
    x = 7,435.27/87.16
  6. Step 6: Final answer
    x = 85.31

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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.