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Finding the Fourth Proportional to 89.73, 123.87 and 66.12

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Solution

The fourth proportional to 89.73, 123.87 and 66.12 is: 91.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.73 : 123.87 = 66.12 : x
  2. Step 2: Convert to fraction form
    89.73/123.87 = 66.12/x
  3. Step 3: Cross multiply
    89.73x = 123.87 × 66.12
  4. Step 4: Simplify right side
    89.73x = 8,190.28
  5. Step 5: Solve for x
    x = 8,190.28/89.73
  6. Step 6: Final answer
    x = 91.28

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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.