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Finding the Fourth Proportional to 988.20, 1,480.68 and 439.56

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Solution

The fourth proportional to 988.20, 1,480.68 and 439.56 is: 658.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.20 : 1,480.68 = 439.56 : x
  2. Step 2: Convert to fraction form
    988.20/1,480.68 = 439.56/x
  3. Step 3: Cross multiply
    988.20x = 1,480.68 × 439.56
  4. Step 4: Simplify right side
    988.20x = 650,847.70
  5. Step 5: Solve for x
    x = 650,847.70/988.20
  6. Step 6: Final answer
    x = 658.62

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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.