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Finding the Fourth Proportional to 712.78, 1,067.28 and 387.16

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Solution

The fourth proportional to 712.78, 1,067.28 and 387.16 is: 579.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.78 : 1,067.28 = 387.16 : x
  2. Step 2: Convert to fraction form
    712.78/1,067.28 = 387.16/x
  3. Step 3: Cross multiply
    712.78x = 1,067.28 × 387.16
  4. Step 4: Simplify right side
    712.78x = 413,208.12
  5. Step 5: Solve for x
    x = 413,208.12/712.78
  6. Step 6: Final answer
    x = 579.71

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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.