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Finding the Fourth Proportional to 974.52, 1,344.30 and 679.80

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Solution

The fourth proportional to 974.52, 1,344.30 and 679.80 is: 937.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.52 : 1,344.30 = 679.80 : x
  2. Step 2: Convert to fraction form
    974.52/1,344.30 = 679.80/x
  3. Step 3: Cross multiply
    974.52x = 1,344.30 × 679.80
  4. Step 4: Simplify right side
    974.52x = 913,855.14
  5. Step 5: Solve for x
    x = 913,855.14/974.52
  6. Step 6: Final answer
    x = 937.75

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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.