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Finding the Fourth Proportional to 674.68, 1,012.30 and 328.20

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Solution

The fourth proportional to 674.68, 1,012.30 and 328.20 is: 492.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.68 : 1,012.30 = 328.20 : x
  2. Step 2: Convert to fraction form
    674.68/1,012.30 = 328.20/x
  3. Step 3: Cross multiply
    674.68x = 1,012.30 × 328.20
  4. Step 4: Simplify right side
    674.68x = 332,236.86
  5. Step 5: Solve for x
    x = 332,236.86/674.68
  6. Step 6: Final answer
    x = 492.44

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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.