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Finding the Fourth Proportional to 548.28, 821.16 and 424.80

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Solution

The fourth proportional to 548.28, 821.16 and 424.80 is: 636.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.28 : 821.16 = 424.80 : x
  2. Step 2: Convert to fraction form
    548.28/821.16 = 424.80/x
  3. Step 3: Cross multiply
    548.28x = 821.16 × 424.80
  4. Step 4: Simplify right side
    548.28x = 348,828.77
  5. Step 5: Solve for x
    x = 348,828.77/548.28
  6. Step 6: Final answer
    x = 636.22

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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.