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Finding the Fourth Proportional to 82.28, 123.47 and 38.90

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Solution

The fourth proportional to 82.28, 123.47 and 38.90 is: 58.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.28 : 123.47 = 38.90 : x
  2. Step 2: Convert to fraction form
    82.28/123.47 = 38.90/x
  3. Step 3: Cross multiply
    82.28x = 123.47 × 38.90
  4. Step 4: Simplify right side
    82.28x = 4,802.98
  5. Step 5: Solve for x
    x = 4,802.98/82.28
  6. Step 6: Final answer
    x = 58.37

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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.