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Finding the Fourth Proportional to 274.08, 411.24 and 129.90

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Solution

The fourth proportional to 274.08, 411.24 and 129.90 is: 194.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.08 : 411.24 = 129.90 : x
  2. Step 2: Convert to fraction form
    274.08/411.24 = 129.90/x
  3. Step 3: Cross multiply
    274.08x = 411.24 × 129.90
  4. Step 4: Simplify right side
    274.08x = 53,420.08
  5. Step 5: Solve for x
    x = 53,420.08/274.08
  6. Step 6: Final answer
    x = 194.91

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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.