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Finding the Fourth Proportional to 87.98, 121.47 and 69.53

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Solution

The fourth proportional to 87.98, 121.47 and 69.53 is: 96.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.98 : 121.47 = 69.53 : x
  2. Step 2: Convert to fraction form
    87.98/121.47 = 69.53/x
  3. Step 3: Cross multiply
    87.98x = 121.47 × 69.53
  4. Step 4: Simplify right side
    87.98x = 8,445.20
  5. Step 5: Solve for x
    x = 8,445.20/87.98
  6. Step 6: Final answer
    x = 96.00

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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.