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Finding the Fourth Proportional to 82.14, 113.42 and 63.70

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Solution

The fourth proportional to 82.14, 113.42 and 63.70 is: 87.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.14 : 113.42 = 63.70 : x
  2. Step 2: Convert to fraction form
    82.14/113.42 = 63.70/x
  3. Step 3: Cross multiply
    82.14x = 113.42 × 63.70
  4. Step 4: Simplify right side
    82.14x = 7,224.85
  5. Step 5: Solve for x
    x = 7,224.85/82.14
  6. Step 6: Final answer
    x = 87.96

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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.