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Finding the Fourth Proportional to 274.59, 411.88 and 82.20

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Solution

The fourth proportional to 274.59, 411.88 and 82.20 is: 123.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.59 : 411.88 = 82.20 : x
  2. Step 2: Convert to fraction form
    274.59/411.88 = 82.20/x
  3. Step 3: Cross multiply
    274.59x = 411.88 × 82.20
  4. Step 4: Simplify right side
    274.59x = 33,856.54
  5. Step 5: Solve for x
    x = 33,856.54/274.59
  6. Step 6: Final answer
    x = 123.30

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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.