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Finding the Fourth Proportional to 391.52, 540.42 and 251.66

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Solution

The fourth proportional to 391.52, 540.42 and 251.66 is: 347.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.52 : 540.42 = 251.66 : x
  2. Step 2: Convert to fraction form
    391.52/540.42 = 251.66/x
  3. Step 3: Cross multiply
    391.52x = 540.42 × 251.66
  4. Step 4: Simplify right side
    391.52x = 136,002.10
  5. Step 5: Solve for x
    x = 136,002.10/391.52
  6. Step 6: Final answer
    x = 347.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.