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Finding the Fourth Proportional to 987.78, 1,481.61 and 371.43

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Solution

The fourth proportional to 987.78, 1,481.61 and 371.43 is: 557.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.78 : 1,481.61 = 371.43 : x
  2. Step 2: Convert to fraction form
    987.78/1,481.61 = 371.43/x
  3. Step 3: Cross multiply
    987.78x = 1,481.61 × 371.43
  4. Step 4: Simplify right side
    987.78x = 550,314.40
  5. Step 5: Solve for x
    x = 550,314.40/987.78
  6. Step 6: Final answer
    x = 557.12

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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.