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Finding the Fourth Proportional to 987.71, 1,481.82 and 439.76

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Solution

The fourth proportional to 987.71, 1,481.82 and 439.76 is: 659.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.71 : 1,481.82 = 439.76 : x
  2. Step 2: Convert to fraction form
    987.71/1,481.82 = 439.76/x
  3. Step 3: Cross multiply
    987.71x = 1,481.82 × 439.76
  4. Step 4: Simplify right side
    987.71x = 651,636.11
  5. Step 5: Solve for x
    x = 651,636.11/987.71
  6. Step 6: Final answer
    x = 659.75

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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.