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Finding the Fourth Proportional to 82.35, 113.47 and 76.88

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Solution

The fourth proportional to 82.35, 113.47 and 76.88 is: 105.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.35 : 113.47 = 76.88 : x
  2. Step 2: Convert to fraction form
    82.35/113.47 = 76.88/x
  3. Step 3: Cross multiply
    82.35x = 113.47 × 76.88
  4. Step 4: Simplify right side
    82.35x = 8,723.67
  5. Step 5: Solve for x
    x = 8,723.67/82.35
  6. Step 6: Final answer
    x = 105.93

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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.