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Finding the Fourth Proportional to 674.70, 1,012.05 and 439.80

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Solution

The fourth proportional to 674.70, 1,012.05 and 439.80 is: 659.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.70 : 1,012.05 = 439.80 : x
  2. Step 2: Convert to fraction form
    674.70/1,012.05 = 439.80/x
  3. Step 3: Cross multiply
    674.70x = 1,012.05 × 439.80
  4. Step 4: Simplify right side
    674.70x = 445,099.59
  5. Step 5: Solve for x
    x = 445,099.59/674.70
  6. Step 6: Final answer
    x = 659.70

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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.