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Finding the Fourth Proportional to 711.20, 1,067.28 and 528.80

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Solution

The fourth proportional to 711.20, 1,067.28 and 528.80 is: 793.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.20 : 1,067.28 = 528.80 : x
  2. Step 2: Convert to fraction form
    711.20/1,067.28 = 528.80/x
  3. Step 3: Cross multiply
    711.20x = 1,067.28 × 528.80
  4. Step 4: Simplify right side
    711.20x = 564,377.66
  5. Step 5: Solve for x
    x = 564,377.66/711.20
  6. Step 6: Final answer
    x = 793.56

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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.