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Finding the Fourth Proportional to 1,211.96, 1,817.89 and 711.92

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Solution

The fourth proportional to 1,211.96, 1,817.89 and 711.92 is: 1,067.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.96 : 1,817.89 = 711.92 : x
  2. Step 2: Convert to fraction form
    1,211.96/1,817.89 = 711.92/x
  3. Step 3: Cross multiply
    1,211.96x = 1,817.89 × 711.92
  4. Step 4: Simplify right side
    1,211.96x = 1,294,195.01
  5. Step 5: Solve for x
    x = 1,294,195.01/1,211.96
  6. Step 6: Final answer
    x = 1,067.85

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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.