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Finding the Fourth Proportional to 82.48, 113.72 and 57.90

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Solution

The fourth proportional to 82.48, 113.72 and 57.90 is: 79.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.48 : 113.72 = 57.90 : x
  2. Step 2: Convert to fraction form
    82.48/113.72 = 57.90/x
  3. Step 3: Cross multiply
    82.48x = 113.72 × 57.90
  4. Step 4: Simplify right side
    82.48x = 6,584.39
  5. Step 5: Solve for x
    x = 6,584.39/82.48
  6. Step 6: Final answer
    x = 79.83

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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.