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Finding the Fourth Proportional to 220.74, 331.02 and 83.71

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Solution

The fourth proportional to 220.74, 331.02 and 83.71 is: 125.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.74 : 331.02 = 83.71 : x
  2. Step 2: Convert to fraction form
    220.74/331.02 = 83.71/x
  3. Step 3: Cross multiply
    220.74x = 331.02 × 83.71
  4. Step 4: Simplify right side
    220.74x = 27,710.41
  5. Step 5: Solve for x
    x = 27,710.41/220.74
  6. Step 6: Final answer
    x = 125.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.