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Finding the Fourth Proportional to 87.68, 121.04 and 84.80

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Solution

The fourth proportional to 87.68, 121.04 and 84.80 is: 117.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.68 : 121.04 = 84.80 : x
  2. Step 2: Convert to fraction form
    87.68/121.04 = 84.80/x
  3. Step 3: Cross multiply
    87.68x = 121.04 × 84.80
  4. Step 4: Simplify right side
    87.68x = 10,264.19
  5. Step 5: Solve for x
    x = 10,264.19/87.68
  6. Step 6: Final answer
    x = 117.06

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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.