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Finding the Fourth Proportional to 391.24, 540.03 and 275.14

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Solution

The fourth proportional to 391.24, 540.03 and 275.14 is: 379.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.24 : 540.03 = 275.14 : x
  2. Step 2: Convert to fraction form
    391.24/540.03 = 275.14/x
  3. Step 3: Cross multiply
    391.24x = 540.03 × 275.14
  4. Step 4: Simplify right side
    391.24x = 148,583.85
  5. Step 5: Solve for x
    x = 148,583.85/391.24
  6. Step 6: Final answer
    x = 379.78

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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.