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Finding the Fourth Proportional to 89.62, 133.78 and 83.27

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Solution

The fourth proportional to 89.62, 133.78 and 83.27 is: 124.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.62 : 133.78 = 83.27 : x
  2. Step 2: Convert to fraction form
    89.62/133.78 = 83.27/x
  3. Step 3: Cross multiply
    89.62x = 133.78 × 83.27
  4. Step 4: Simplify right side
    89.62x = 11,139.86
  5. Step 5: Solve for x
    x = 11,139.86/89.62
  6. Step 6: Final answer
    x = 124.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.