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Finding the Fourth Proportional to 1,889.76, 2,608.20 and 1,191.36

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Solution

The fourth proportional to 1,889.76, 2,608.20 and 1,191.36 is: 1,644.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,889.76 : 2,608.20 = 1,191.36 : x
  2. Step 2: Convert to fraction form
    1,889.76/2,608.20 = 1,191.36/x
  3. Step 3: Cross multiply
    1,889.76x = 2,608.20 × 1,191.36
  4. Step 4: Simplify right side
    1,889.76x = 3,107,305.15
  5. Step 5: Solve for x
    x = 3,107,305.15/1,889.76
  6. Step 6: Final answer
    x = 1,644.29

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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.