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Finding the Fourth Proportional to 89.72, 123.78 and 60.20

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Solution

The fourth proportional to 89.72, 123.78 and 60.20 is: 83.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.72 : 123.78 = 60.20 : x
  2. Step 2: Convert to fraction form
    89.72/123.78 = 60.20/x
  3. Step 3: Cross multiply
    89.72x = 123.78 × 60.20
  4. Step 4: Simplify right side
    89.72x = 7,451.56
  5. Step 5: Solve for x
    x = 7,451.56/89.72
  6. Step 6: Final answer
    x = 83.05

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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.