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Finding the Fourth Proportional to 712.97, 1,069.42 and 225.96

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Solution

The fourth proportional to 712.97, 1,069.42 and 225.96 is: 338.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.97 : 1,069.42 = 225.96 : x
  2. Step 2: Convert to fraction form
    712.97/1,069.42 = 225.96/x
  3. Step 3: Cross multiply
    712.97x = 1,069.42 × 225.96
  4. Step 4: Simplify right side
    712.97x = 241,641.99
  5. Step 5: Solve for x
    x = 241,641.99/712.97
  6. Step 6: Final answer
    x = 338.92

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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.