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Finding the Fourth Proportional to 391.92, 541.86 and 374.70

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Solution

The fourth proportional to 391.92, 541.86 and 374.70 is: 518.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.92 : 541.86 = 374.70 : x
  2. Step 2: Convert to fraction form
    391.92/541.86 = 374.70/x
  3. Step 3: Cross multiply
    391.92x = 541.86 × 374.70
  4. Step 4: Simplify right side
    391.92x = 203,034.94
  5. Step 5: Solve for x
    x = 203,034.94/391.92
  6. Step 6: Final answer
    x = 518.05

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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.