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Finding the Fourth Proportional to 550.40, 819.28 and 548

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Solution

The fourth proportional to 550.40, 819.28 and 548 is: 815.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.40 : 819.28 = 548 : x
  2. Step 2: Convert to fraction form
    550.40/819.28 = 548/x
  3. Step 3: Cross multiply
    550.40x = 819.28 × 548
  4. Step 4: Simplify right side
    550.40x = 448,965.44
  5. Step 5: Solve for x
    x = 448,965.44/550.40
  6. Step 6: Final answer
    x = 815.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.