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Finding the Fourth Proportional to 82.85, 124.28 and 21.99

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Solution

The fourth proportional to 82.85, 124.28 and 21.99 is: 32.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.85 : 124.28 = 21.99 : x
  2. Step 2: Convert to fraction form
    82.85/124.28 = 21.99/x
  3. Step 3: Cross multiply
    82.85x = 124.28 × 21.99
  4. Step 4: Simplify right side
    82.85x = 2,732.97
  5. Step 5: Solve for x
    x = 2,732.97/82.85
  6. Step 6: Final answer
    x = 32.99

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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.