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Finding the Fourth Proportional to 1,311.20, 1,964.19 and 791.34

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Solution

The fourth proportional to 1,311.20, 1,964.19 and 791.34 is: 1,185.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.20 : 1,964.19 = 791.34 : x
  2. Step 2: Convert to fraction form
    1,311.20/1,964.19 = 791.34/x
  3. Step 3: Cross multiply
    1,311.20x = 1,964.19 × 791.34
  4. Step 4: Simplify right side
    1,311.20x = 1,554,342.11
  5. Step 5: Solve for x
    x = 1,554,342.11/1,311.20
  6. Step 6: Final answer
    x = 1,185.44

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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.