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Finding the Fourth Proportional to 1,921.11, 2,882.09 and 689.41

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Solution

The fourth proportional to 1,921.11, 2,882.09 and 689.41 is: 1,034.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.11 : 2,882.09 = 689.41 : x
  2. Step 2: Convert to fraction form
    1,921.11/2,882.09 = 689.41/x
  3. Step 3: Cross multiply
    1,921.11x = 2,882.09 × 689.41
  4. Step 4: Simplify right side
    1,921.11x = 1,986,941.67
  5. Step 5: Solve for x
    x = 1,986,941.67/1,921.11
  6. Step 6: Final answer
    x = 1,034.27

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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.