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Finding the Fourth Proportional to 974.80, 1,344.96 and 625.20

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Solution

The fourth proportional to 974.80, 1,344.96 and 625.20 is: 862.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.80 : 1,344.96 = 625.20 : x
  2. Step 2: Convert to fraction form
    974.80/1,344.96 = 625.20/x
  3. Step 3: Cross multiply
    974.80x = 1,344.96 × 625.20
  4. Step 4: Simplify right side
    974.80x = 840,868.99
  5. Step 5: Solve for x
    x = 840,868.99/974.80
  6. Step 6: Final answer
    x = 862.61

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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.