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Finding the Fourth Proportional to 548.48, 821.92 and 287.91

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Solution

The fourth proportional to 548.48, 821.92 and 287.91 is: 431.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.48 : 821.92 = 287.91 : x
  2. Step 2: Convert to fraction form
    548.48/821.92 = 287.91/x
  3. Step 3: Cross multiply
    548.48x = 821.92 × 287.91
  4. Step 4: Simplify right side
    548.48x = 236,638.99
  5. Step 5: Solve for x
    x = 236,638.99/548.48
  6. Step 6: Final answer
    x = 431.45

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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.