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Finding the Fourth Proportional to 711.85, 1,067.78 and 300.88

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Solution

The fourth proportional to 711.85, 1,067.78 and 300.88 is: 451.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.85 : 1,067.78 = 300.88 : x
  2. Step 2: Convert to fraction form
    711.85/1,067.78 = 300.88/x
  3. Step 3: Cross multiply
    711.85x = 1,067.78 × 300.88
  4. Step 4: Simplify right side
    711.85x = 321,273.65
  5. Step 5: Solve for x
    x = 321,273.65/711.85
  6. Step 6: Final answer
    x = 451.32

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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.