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Finding the Fourth Proportional to 82.30, 113.38 and 61.54

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Solution

The fourth proportional to 82.30, 113.38 and 61.54 is: 84.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.30 : 113.38 = 61.54 : x
  2. Step 2: Convert to fraction form
    82.30/113.38 = 61.54/x
  3. Step 3: Cross multiply
    82.30x = 113.38 × 61.54
  4. Step 4: Simplify right side
    82.30x = 6,976.97
  5. Step 5: Solve for x
    x = 6,976.97/82.30
  6. Step 6: Final answer
    x = 84.78

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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.