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Finding the Fourth Proportional to 987.33, 1,481.03 and 256.92

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Solution

The fourth proportional to 987.33, 1,481.03 and 256.92 is: 385.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.33 : 1,481.03 = 256.92 : x
  2. Step 2: Convert to fraction form
    987.33/1,481.03 = 256.92/x
  3. Step 3: Cross multiply
    987.33x = 1,481.03 × 256.92
  4. Step 4: Simplify right side
    987.33x = 380,504.94
  5. Step 5: Solve for x
    x = 380,504.94/987.33
  6. Step 6: Final answer
    x = 385.39

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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.