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Finding the Fourth Proportional to 675.38, 1,012.72 and 328.49

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Solution

The fourth proportional to 675.38, 1,012.72 and 328.49 is: 492.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.38 : 1,012.72 = 328.49 : x
  2. Step 2: Convert to fraction form
    675.38/1,012.72 = 328.49/x
  3. Step 3: Cross multiply
    675.38x = 1,012.72 × 328.49
  4. Step 4: Simplify right side
    675.38x = 332,668.39
  5. Step 5: Solve for x
    x = 332,668.39/675.38
  6. Step 6: Final answer
    x = 492.56

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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.