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Finding the Fourth Proportional to 89.68, 123.78 and 60.22

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Solution

The fourth proportional to 89.68, 123.78 and 60.22 is: 83.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.68 : 123.78 = 60.22 : x
  2. Step 2: Convert to fraction form
    89.68/123.78 = 60.22/x
  3. Step 3: Cross multiply
    89.68x = 123.78 × 60.22
  4. Step 4: Simplify right side
    89.68x = 7,454.03
  5. Step 5: Solve for x
    x = 7,454.03/89.68
  6. Step 6: Final answer
    x = 83.12

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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.