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Finding the Fourth Proportional to 712.88, 1,069.49 and 199.88

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Solution

The fourth proportional to 712.88, 1,069.49 and 199.88 is: 299.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.88 : 1,069.49 = 199.88 : x
  2. Step 2: Convert to fraction form
    712.88/1,069.49 = 199.88/x
  3. Step 3: Cross multiply
    712.88x = 1,069.49 × 199.88
  4. Step 4: Simplify right side
    712.88x = 213,764.81
  5. Step 5: Solve for x
    x = 213,764.81/712.88
  6. Step 6: Final answer
    x = 299.86

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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.