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Finding the Fourth Proportional to 541.28, 813.12 and 387.68

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Solution

The fourth proportional to 541.28, 813.12 and 387.68 is: 582.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.28 : 813.12 = 387.68 : x
  2. Step 2: Convert to fraction form
    541.28/813.12 = 387.68/x
  3. Step 3: Cross multiply
    541.28x = 813.12 × 387.68
  4. Step 4: Simplify right side
    541.28x = 315,230.36
  5. Step 5: Solve for x
    x = 315,230.36/541.28
  6. Step 6: Final answer
    x = 582.38

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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.