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Finding the Fourth Proportional to 391.85, 541.01 and 318.32

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Solution

The fourth proportional to 391.85, 541.01 and 318.32 is: 439.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.85 : 541.01 = 318.32 : x
  2. Step 2: Convert to fraction form
    391.85/541.01 = 318.32/x
  3. Step 3: Cross multiply
    391.85x = 541.01 × 318.32
  4. Step 4: Simplify right side
    391.85x = 172,214.30
  5. Step 5: Solve for x
    x = 172,214.30/391.85
  6. Step 6: Final answer
    x = 439.49

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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.