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Finding the Fourth Proportional to 548.28, 821.72 and 479.48

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Solution

The fourth proportional to 548.28, 821.72 and 479.48 is: 718.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.28 : 821.72 = 479.48 : x
  2. Step 2: Convert to fraction form
    548.28/821.72 = 479.48/x
  3. Step 3: Cross multiply
    548.28x = 821.72 × 479.48
  4. Step 4: Simplify right side
    548.28x = 393,998.31
  5. Step 5: Solve for x
    x = 393,998.31/548.28
  6. Step 6: Final answer
    x = 718.61

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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.