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Finding the Fourth Proportional to 87.99, 121.44 and 69.58

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Solution

The fourth proportional to 87.99, 121.44 and 69.58 is: 96.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.99 : 121.44 = 69.58 : x
  2. Step 2: Convert to fraction form
    87.99/121.44 = 69.58/x
  3. Step 3: Cross multiply
    87.99x = 121.44 × 69.58
  4. Step 4: Simplify right side
    87.99x = 8,449.80
  5. Step 5: Solve for x
    x = 8,449.80/87.99
  6. Step 6: Final answer
    x = 96.03

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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.