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Finding the Fourth Proportional to 82.18, 123.29 and 30.85

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Solution

The fourth proportional to 82.18, 123.29 and 30.85 is: 46.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.18 : 123.29 = 30.85 : x
  2. Step 2: Convert to fraction form
    82.18/123.29 = 30.85/x
  3. Step 3: Cross multiply
    82.18x = 123.29 × 30.85
  4. Step 4: Simplify right side
    82.18x = 3,803.50
  5. Step 5: Solve for x
    x = 3,803.50/82.18
  6. Step 6: Final answer
    x = 46.29

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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.