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Finding the Fourth Proportional to 974.80, 1,344.72 and 864.40

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Solution

The fourth proportional to 974.80, 1,344.72 and 864.40 is: 1,192.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.80 : 1,344.72 = 864.40 : x
  2. Step 2: Convert to fraction form
    974.80/1,344.72 = 864.40/x
  3. Step 3: Cross multiply
    974.80x = 1,344.72 × 864.40
  4. Step 4: Simplify right side
    974.80x = 1,162,375.97
  5. Step 5: Solve for x
    x = 1,162,375.97/974.80
  6. Step 6: Final answer
    x = 1,192.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.