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Finding the Fourth Proportional to 912.97, 1,369.04 and 425.75

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Solution

The fourth proportional to 912.97, 1,369.04 and 425.75 is: 638.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.97 : 1,369.04 = 425.75 : x
  2. Step 2: Convert to fraction form
    912.97/1,369.04 = 425.75/x
  3. Step 3: Cross multiply
    912.97x = 1,369.04 × 425.75
  4. Step 4: Simplify right side
    912.97x = 582,868.78
  5. Step 5: Solve for x
    x = 582,868.78/912.97
  6. Step 6: Final answer
    x = 638.43

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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.