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Finding the Fourth Proportional to 261.28, 391.96 and 124.48

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Solution

The fourth proportional to 261.28, 391.96 and 124.48 is: 186.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.28 : 391.96 = 124.48 : x
  2. Step 2: Convert to fraction form
    261.28/391.96 = 124.48/x
  3. Step 3: Cross multiply
    261.28x = 391.96 × 124.48
  4. Step 4: Simplify right side
    261.28x = 48,791.18
  5. Step 5: Solve for x
    x = 48,791.18/261.28
  6. Step 6: Final answer
    x = 186.74

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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.