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Finding the Fourth Proportional to 711.49, 1,067.39 and 278.65

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Solution

The fourth proportional to 711.49, 1,067.39 and 278.65 is: 418.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.49 : 1,067.39 = 278.65 : x
  2. Step 2: Convert to fraction form
    711.49/1,067.39 = 278.65/x
  3. Step 3: Cross multiply
    711.49x = 1,067.39 × 278.65
  4. Step 4: Simplify right side
    711.49x = 297,428.22
  5. Step 5: Solve for x
    x = 297,428.22/711.49
  6. Step 6: Final answer
    x = 418.04

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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.