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Finding the Fourth Proportional to 712.68, 1,067.28 and 403.59

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Solution

The fourth proportional to 712.68, 1,067.28 and 403.59 is: 604.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.68 : 1,067.28 = 403.59 : x
  2. Step 2: Convert to fraction form
    712.68/1,067.28 = 403.59/x
  3. Step 3: Cross multiply
    712.68x = 1,067.28 × 403.59
  4. Step 4: Simplify right side
    712.68x = 430,748.29
  5. Step 5: Solve for x
    x = 430,748.29/712.68
  6. Step 6: Final answer
    x = 604.41

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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.