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Finding the Fourth Proportional to 274.40, 411.24 and 129.98

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Solution

The fourth proportional to 274.40, 411.24 and 129.98 is: 194.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.40 : 411.24 = 129.98 : x
  2. Step 2: Convert to fraction form
    274.40/411.24 = 129.98/x
  3. Step 3: Cross multiply
    274.40x = 411.24 × 129.98
  4. Step 4: Simplify right side
    274.40x = 53,452.98
  5. Step 5: Solve for x
    x = 53,452.98/274.40
  6. Step 6: Final answer
    x = 194.80

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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.