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Finding the Fourth Proportional to 712.76, 1,069.19 and 225.85

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Solution

The fourth proportional to 712.76, 1,069.19 and 225.85 is: 338.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.76 : 1,069.19 = 225.85 : x
  2. Step 2: Convert to fraction form
    712.76/1,069.19 = 225.85/x
  3. Step 3: Cross multiply
    712.76x = 1,069.19 × 225.85
  4. Step 4: Simplify right side
    712.76x = 241,476.56
  5. Step 5: Solve for x
    x = 241,476.56/712.76
  6. Step 6: Final answer
    x = 338.79

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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.