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Finding the Fourth Proportional to 987, 1,479.50 and 439.04

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Solution

The fourth proportional to 987, 1,479.50 and 439.04 is: 658.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    987 : 1,479.50 = 439.04 : x
  2. Step 2: Convert to fraction form
    987/1,479.50 = 439.04/x
  3. Step 3: Cross multiply
    987x = 1,479.50 × 439.04
  4. Step 4: Simplify right side
    987x = 649,559.68
  5. Step 5: Solve for x
    x = 649,559.68/987
  6. Step 6: Final answer
    x = 658.12

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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.