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Finding the Fourth Proportional to 82.31, 123.39 and 69.48

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Solution

The fourth proportional to 82.31, 123.39 and 69.48 is: 104.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.31 : 123.39 = 69.48 : x
  2. Step 2: Convert to fraction form
    82.31/123.39 = 69.48/x
  3. Step 3: Cross multiply
    82.31x = 123.39 × 69.48
  4. Step 4: Simplify right side
    82.31x = 8,573.14
  5. Step 5: Solve for x
    x = 8,573.14/82.31
  6. Step 6: Final answer
    x = 104.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.