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Finding the Fourth Proportional to 2,689.07, 4,034.02 and 839.79

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Solution

The fourth proportional to 2,689.07, 4,034.02 and 839.79 is: 1,259.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.07 : 4,034.02 = 839.79 : x
  2. Step 2: Convert to fraction form
    2,689.07/4,034.02 = 839.79/x
  3. Step 3: Cross multiply
    2,689.07x = 4,034.02 × 839.79
  4. Step 4: Simplify right side
    2,689.07x = 3,387,729.66
  5. Step 5: Solve for x
    x = 3,387,729.66/2,689.07
  6. Step 6: Final answer
    x = 1,259.81

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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.