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Finding the Fourth Proportional to 82.18, 123.17 and 30.80

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Solution

The fourth proportional to 82.18, 123.17 and 30.80 is: 46.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.18 : 123.17 = 30.80 : x
  2. Step 2: Convert to fraction form
    82.18/123.17 = 30.80/x
  3. Step 3: Cross multiply
    82.18x = 123.17 × 30.80
  4. Step 4: Simplify right side
    82.18x = 3,793.64
  5. Step 5: Solve for x
    x = 3,793.64/82.18
  6. Step 6: Final answer
    x = 46.16

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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.