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Finding the Fourth Proportional to 391.60, 541.46 and 385.40

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Solution

The fourth proportional to 391.60, 541.46 and 385.40 is: 532.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.60 : 541.46 = 385.40 : x
  2. Step 2: Convert to fraction form
    391.60/541.46 = 385.40/x
  3. Step 3: Cross multiply
    391.60x = 541.46 × 385.40
  4. Step 4: Simplify right side
    391.60x = 208,678.68
  5. Step 5: Solve for x
    x = 208,678.68/391.60
  6. Step 6: Final answer
    x = 532.89

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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.