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Finding the Fourth Proportional to 89.97, 124.14 and 87.63

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Solution

The fourth proportional to 89.97, 124.14 and 87.63 is: 120.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.97 : 124.14 = 87.63 : x
  2. Step 2: Convert to fraction form
    89.97/124.14 = 87.63/x
  3. Step 3: Cross multiply
    89.97x = 124.14 × 87.63
  4. Step 4: Simplify right side
    89.97x = 10,878.39
  5. Step 5: Solve for x
    x = 10,878.39/89.97
  6. Step 6: Final answer
    x = 120.91

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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.