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Finding the Fourth Proportional to 391.71, 538.87 and 338.86

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Solution

The fourth proportional to 391.71, 538.87 and 338.86 is: 466.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.71 : 538.87 = 338.86 : x
  2. Step 2: Convert to fraction form
    391.71/538.87 = 338.86/x
  3. Step 3: Cross multiply
    391.71x = 538.87 × 338.86
  4. Step 4: Simplify right side
    391.71x = 182,601.49
  5. Step 5: Solve for x
    x = 182,601.49/391.71
  6. Step 6: Final answer
    x = 466.16

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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.