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Finding the Fourth Proportional to 274.74, 411.65 and 128.25

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Solution

The fourth proportional to 274.74, 411.65 and 128.25 is: 192.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.74 : 411.65 = 128.25 : x
  2. Step 2: Convert to fraction form
    274.74/411.65 = 128.25/x
  3. Step 3: Cross multiply
    274.74x = 411.65 × 128.25
  4. Step 4: Simplify right side
    274.74x = 52,793.47
  5. Step 5: Solve for x
    x = 52,793.47/274.74
  6. Step 6: Final answer
    x = 192.16

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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.