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Finding the Fourth Proportional to 987.96, 1,481.40 and 371.82

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Solution

The fourth proportional to 987.96, 1,481.40 and 371.82 is: 557.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.96 : 1,481.40 = 371.82 : x
  2. Step 2: Convert to fraction form
    987.96/1,481.40 = 371.82/x
  3. Step 3: Cross multiply
    987.96x = 1,481.40 × 371.82
  4. Step 4: Simplify right side
    987.96x = 550,814.15
  5. Step 5: Solve for x
    x = 550,814.15/987.96
  6. Step 6: Final answer
    x = 557.53

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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.