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Finding the Fourth Proportional to 82.39, 123.45 and 41.80

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Solution

The fourth proportional to 82.39, 123.45 and 41.80 is: 62.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.39 : 123.45 = 41.80 : x
  2. Step 2: Convert to fraction form
    82.39/123.45 = 41.80/x
  3. Step 3: Cross multiply
    82.39x = 123.45 × 41.80
  4. Step 4: Simplify right side
    82.39x = 5,160.21
  5. Step 5: Solve for x
    x = 5,160.21/82.39
  6. Step 6: Final answer
    x = 62.63

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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.