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Finding the Fourth Proportional to 711.70, 1,067.52 and 191.64

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Solution

The fourth proportional to 711.70, 1,067.52 and 191.64 is: 287.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.70 : 1,067.52 = 191.64 : x
  2. Step 2: Convert to fraction form
    711.70/1,067.52 = 191.64/x
  3. Step 3: Cross multiply
    711.70x = 1,067.52 × 191.64
  4. Step 4: Simplify right side
    711.70x = 204,579.53
  5. Step 5: Solve for x
    x = 204,579.53/711.70
  6. Step 6: Final answer
    x = 287.45

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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.