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Finding the Fourth Proportional to 82.43, 113.86 and 69.39

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Solution

The fourth proportional to 82.43, 113.86 and 69.39 is: 95.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.43 : 113.86 = 69.39 : x
  2. Step 2: Convert to fraction form
    82.43/113.86 = 69.39/x
  3. Step 3: Cross multiply
    82.43x = 113.86 × 69.39
  4. Step 4: Simplify right side
    82.43x = 7,900.44
  5. Step 5: Solve for x
    x = 7,900.44/82.43
  6. Step 6: Final answer
    x = 95.84

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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.