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Finding the Fourth Proportional to 712.79, 1,067.36 and 517.79

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Solution

The fourth proportional to 712.79, 1,067.36 and 517.79 is: 775.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.79 : 1,067.36 = 517.79 : x
  2. Step 2: Convert to fraction form
    712.79/1,067.36 = 517.79/x
  3. Step 3: Cross multiply
    712.79x = 1,067.36 × 517.79
  4. Step 4: Simplify right side
    712.79x = 552,660.41
  5. Step 5: Solve for x
    x = 552,660.41/712.79
  6. Step 6: Final answer
    x = 775.35

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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.