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Finding the Fourth Proportional to 89.97, 135.72 and 87.24

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Solution

The fourth proportional to 89.97, 135.72 and 87.24 is: 131.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.97 : 135.72 = 87.24 : x
  2. Step 2: Convert to fraction form
    89.97/135.72 = 87.24/x
  3. Step 3: Cross multiply
    89.97x = 135.72 × 87.24
  4. Step 4: Simplify right side
    89.97x = 11,840.21
  5. Step 5: Solve for x
    x = 11,840.21/89.97
  6. Step 6: Final answer
    x = 131.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.