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Finding the Fourth Proportional to 987.52, 1,481.81 and 371.65

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Solution

The fourth proportional to 987.52, 1,481.81 and 371.65 is: 557.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.52 : 1,481.81 = 371.65 : x
  2. Step 2: Convert to fraction form
    987.52/1,481.81 = 371.65/x
  3. Step 3: Cross multiply
    987.52x = 1,481.81 × 371.65
  4. Step 4: Simplify right side
    987.52x = 550,714.69
  5. Step 5: Solve for x
    x = 550,714.69/987.52
  6. Step 6: Final answer
    x = 557.67

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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.