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Finding the Fourth Proportional to 712.11, 1,067.58 and 346.71

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Solution

The fourth proportional to 712.11, 1,067.58 and 346.71 is: 519.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.11 : 1,067.58 = 346.71 : x
  2. Step 2: Convert to fraction form
    712.11/1,067.58 = 346.71/x
  3. Step 3: Cross multiply
    712.11x = 1,067.58 × 346.71
  4. Step 4: Simplify right side
    712.11x = 370,140.66
  5. Step 5: Solve for x
    x = 370,140.66/712.11
  6. Step 6: Final answer
    x = 519.78

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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.