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Finding the Fourth Proportional to 974.30, 1,344.20 and 625.20

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Solution

The fourth proportional to 974.30, 1,344.20 and 625.20 is: 862.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.30 : 1,344.20 = 625.20 : x
  2. Step 2: Convert to fraction form
    974.30/1,344.20 = 625.20/x
  3. Step 3: Cross multiply
    974.30x = 1,344.20 × 625.20
  4. Step 4: Simplify right side
    974.30x = 840,393.84
  5. Step 5: Solve for x
    x = 840,393.84/974.30
  6. Step 6: Final answer
    x = 862.56

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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.