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Finding the Fourth Proportional to 987.57, 1,481.40 and 294.21

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Solution

The fourth proportional to 987.57, 1,481.40 and 294.21 is: 441.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.57 : 1,481.40 = 294.21 : x
  2. Step 2: Convert to fraction form
    987.57/1,481.40 = 294.21/x
  3. Step 3: Cross multiply
    987.57x = 1,481.40 × 294.21
  4. Step 4: Simplify right side
    987.57x = 435,842.69
  5. Step 5: Solve for x
    x = 435,842.69/987.57
  6. Step 6: Final answer
    x = 441.33

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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.