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Finding the Fourth Proportional to 82.22, 123.30 and 38.86

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Solution

The fourth proportional to 82.22, 123.30 and 38.86 is: 58.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.22 : 123.30 = 38.86 : x
  2. Step 2: Convert to fraction form
    82.22/123.30 = 38.86/x
  3. Step 3: Cross multiply
    82.22x = 123.30 × 38.86
  4. Step 4: Simplify right side
    82.22x = 4,791.74
  5. Step 5: Solve for x
    x = 4,791.74/82.22
  6. Step 6: Final answer
    x = 58.28

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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.