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Finding the Fourth Proportional to 711.56, 1,067.38 and 278.70

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Solution

The fourth proportional to 711.56, 1,067.38 and 278.70 is: 418.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.56 : 1,067.38 = 278.70 : x
  2. Step 2: Convert to fraction form
    711.56/1,067.38 = 278.70/x
  3. Step 3: Cross multiply
    711.56x = 1,067.38 × 278.70
  4. Step 4: Simplify right side
    711.56x = 297,478.81
  5. Step 5: Solve for x
    x = 297,478.81/711.56
  6. Step 6: Final answer
    x = 418.07

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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.