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Finding the Fourth Proportional to 711.74, 1,067.97 and 279.14

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Solution

The fourth proportional to 711.74, 1,067.97 and 279.14 is: 418.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.74 : 1,067.97 = 279.14 : x
  2. Step 2: Convert to fraction form
    711.74/1,067.97 = 279.14/x
  3. Step 3: Cross multiply
    711.74x = 1,067.97 × 279.14
  4. Step 4: Simplify right side
    711.74x = 298,113.15
  5. Step 5: Solve for x
    x = 298,113.15/711.74
  6. Step 6: Final answer
    x = 418.85

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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.