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Finding the Fourth Proportional to 391.01, 539.70 and 243.56

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Solution

The fourth proportional to 391.01, 539.70 and 243.56 is: 336.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.01 : 539.70 = 243.56 : x
  2. Step 2: Convert to fraction form
    391.01/539.70 = 243.56/x
  3. Step 3: Cross multiply
    391.01x = 539.70 × 243.56
  4. Step 4: Simplify right side
    391.01x = 131,449.33
  5. Step 5: Solve for x
    x = 131,449.33/391.01
  6. Step 6: Final answer
    x = 336.18

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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.