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Finding the Fourth Proportional to 82.15, 113.31 and 49.38

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Solution

The fourth proportional to 82.15, 113.31 and 49.38 is: 68.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.15 : 113.31 = 49.38 : x
  2. Step 2: Convert to fraction form
    82.15/113.31 = 49.38/x
  3. Step 3: Cross multiply
    82.15x = 113.31 × 49.38
  4. Step 4: Simplify right side
    82.15x = 5,594.68
  5. Step 5: Solve for x
    x = 5,594.68/82.15
  6. Step 6: Final answer
    x = 68.10

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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.