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Finding the Fourth Proportional to 391.28, 585.60 and 299.48

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Solution

The fourth proportional to 391.28, 585.60 and 299.48 is: 448.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.28 : 585.60 = 299.48 : x
  2. Step 2: Convert to fraction form
    391.28/585.60 = 299.48/x
  3. Step 3: Cross multiply
    391.28x = 585.60 × 299.48
  4. Step 4: Simplify right side
    391.28x = 175,375.49
  5. Step 5: Solve for x
    x = 175,375.49/391.28
  6. Step 6: Final answer
    x = 448.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.