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Finding the Fourth Proportional to 675.49, 1,012.98 and 328.72

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Solution

The fourth proportional to 675.49, 1,012.98 and 328.72 is: 492.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.49 : 1,012.98 = 328.72 : x
  2. Step 2: Convert to fraction form
    675.49/1,012.98 = 328.72/x
  3. Step 3: Cross multiply
    675.49x = 1,012.98 × 328.72
  4. Step 4: Simplify right side
    675.49x = 332,981.72
  5. Step 5: Solve for x
    x = 332,981.72/675.49
  6. Step 6: Final answer
    x = 492.95

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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.