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Finding the Fourth Proportional to 1,267.20, 1,747.39 and 869.44

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Solution

The fourth proportional to 1,267.20, 1,747.39 and 869.44 is: 1,198.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.20 : 1,747.39 = 869.44 : x
  2. Step 2: Convert to fraction form
    1,267.20/1,747.39 = 869.44/x
  3. Step 3: Cross multiply
    1,267.20x = 1,747.39 × 869.44
  4. Step 4: Simplify right side
    1,267.20x = 1,519,263.06
  5. Step 5: Solve for x
    x = 1,519,263.06/1,267.20
  6. Step 6: Final answer
    x = 1,198.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.