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Finding the Fourth Proportional to 1,263.26, 1,741.11 and 869.78

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Solution

The fourth proportional to 1,263.26, 1,741.11 and 869.78 is: 1,198.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.26 : 1,741.11 = 869.78 : x
  2. Step 2: Convert to fraction form
    1,263.26/1,741.11 = 869.78/x
  3. Step 3: Cross multiply
    1,263.26x = 1,741.11 × 869.78
  4. Step 4: Simplify right side
    1,263.26x = 1,514,382.66
  5. Step 5: Solve for x
    x = 1,514,382.66/1,263.26
  6. Step 6: Final answer
    x = 1,198.79

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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.