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Finding the Fourth Proportional to 391.57, 540.25 and 251.59

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Solution

The fourth proportional to 391.57, 540.25 and 251.59 is: 347.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.57 : 540.25 = 251.59 : x
  2. Step 2: Convert to fraction form
    391.57/540.25 = 251.59/x
  3. Step 3: Cross multiply
    391.57x = 540.25 × 251.59
  4. Step 4: Simplify right side
    391.57x = 135,921.50
  5. Step 5: Solve for x
    x = 135,921.50/391.57
  6. Step 6: Final answer
    x = 347.12

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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.