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Finding the Fourth Proportional to 87.33, 121.32 and 86.53

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Solution

The fourth proportional to 87.33, 121.32 and 86.53 is: 120.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.33 : 121.32 = 86.53 : x
  2. Step 2: Convert to fraction form
    87.33/121.32 = 86.53/x
  3. Step 3: Cross multiply
    87.33x = 121.32 × 86.53
  4. Step 4: Simplify right side
    87.33x = 10,497.39
  5. Step 5: Solve for x
    x = 10,497.39/87.33
  6. Step 6: Final answer
    x = 120.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.