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Finding the Fourth Proportional to 675.20, 1,012.90 and 328.55

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Solution

The fourth proportional to 675.20, 1,012.90 and 328.55 is: 492.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.20 : 1,012.90 = 328.55 : x
  2. Step 2: Convert to fraction form
    675.20/1,012.90 = 328.55/x
  3. Step 3: Cross multiply
    675.20x = 1,012.90 × 328.55
  4. Step 4: Simplify right side
    675.20x = 332,786.65
  5. Step 5: Solve for x
    x = 332,786.65/675.20
  6. Step 6: Final answer
    x = 492.87

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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.