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Finding the Fourth Proportional to 987, 1,481.07 and 548.31

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Solution

The fourth proportional to 987, 1,481.07 and 548.31 is: 822.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    987 : 1,481.07 = 548.31 : x
  2. Step 2: Convert to fraction form
    987/1,481.07 = 548.31/x
  3. Step 3: Cross multiply
    987x = 1,481.07 × 548.31
  4. Step 4: Simplify right side
    987x = 812,085.49
  5. Step 5: Solve for x
    x = 812,085.49/987
  6. Step 6: Final answer
    x = 822.78

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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.