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Finding the Fourth Proportional to 87.60, 121.41 and 85.98

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Solution

The fourth proportional to 87.60, 121.41 and 85.98 is: 119.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.60 : 121.41 = 85.98 : x
  2. Step 2: Convert to fraction form
    87.60/121.41 = 85.98/x
  3. Step 3: Cross multiply
    87.60x = 121.41 × 85.98
  4. Step 4: Simplify right side
    87.60x = 10,438.83
  5. Step 5: Solve for x
    x = 10,438.83/87.60
  6. Step 6: Final answer
    x = 119.16

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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.