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Finding the Fourth Proportional to 391.64, 539.95 and 251.51

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Solution

The fourth proportional to 391.64, 539.95 and 251.51 is: 346.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.64 : 539.95 = 251.51 : x
  2. Step 2: Convert to fraction form
    391.64/539.95 = 251.51/x
  3. Step 3: Cross multiply
    391.64x = 539.95 × 251.51
  4. Step 4: Simplify right side
    391.64x = 135,799.97
  5. Step 5: Solve for x
    x = 135,799.97/391.64
  6. Step 6: Final answer
    x = 346.75

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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.