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Finding the Fourth Proportional to 89.80, 123.82 and 79.97

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Solution

The fourth proportional to 89.80, 123.82 and 79.97 is: 110.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.80 : 123.82 = 79.97 : x
  2. Step 2: Convert to fraction form
    89.80/123.82 = 79.97/x
  3. Step 3: Cross multiply
    89.80x = 123.82 × 79.97
  4. Step 4: Simplify right side
    89.80x = 9,901.89
  5. Step 5: Solve for x
    x = 9,901.89/89.80
  6. Step 6: Final answer
    x = 110.27

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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.