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Finding the Fourth Proportional to 1,289.26, 1,780.62 and 871.33

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Solution

The fourth proportional to 1,289.26, 1,780.62 and 871.33 is: 1,203.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.26 : 1,780.62 = 871.33 : x
  2. Step 2: Convert to fraction form
    1,289.26/1,780.62 = 871.33/x
  3. Step 3: Cross multiply
    1,289.26x = 1,780.62 × 871.33
  4. Step 4: Simplify right side
    1,289.26x = 1,551,517.57
  5. Step 5: Solve for x
    x = 1,551,517.57/1,289.26
  6. Step 6: Final answer
    x = 1,203.42

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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.