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Finding the Fourth Proportional to 82.81, 124.23 and 28.71

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Solution

The fourth proportional to 82.81, 124.23 and 28.71 is: 43.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.81 : 124.23 = 28.71 : x
  2. Step 2: Convert to fraction form
    82.81/124.23 = 28.71/x
  3. Step 3: Cross multiply
    82.81x = 124.23 × 28.71
  4. Step 4: Simplify right side
    82.81x = 3,566.02
  5. Step 5: Solve for x
    x = 3,566.02/82.81
  6. Step 6: Final answer
    x = 43.06

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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.