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Finding the Fourth Proportional to 391.32, 540.24 and 281.04

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Solution

The fourth proportional to 391.32, 540.24 and 281.04 is: 387.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.32 : 540.24 = 281.04 : x
  2. Step 2: Convert to fraction form
    391.32/540.24 = 281.04/x
  3. Step 3: Cross multiply
    391.32x = 540.24 × 281.04
  4. Step 4: Simplify right side
    391.32x = 151,829.05
  5. Step 5: Solve for x
    x = 151,829.05/391.32
  6. Step 6: Final answer
    x = 387.99

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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.