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Finding the Fourth Proportional to 1,839.52, 2,759.28 and 685

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Solution

The fourth proportional to 1,839.52, 2,759.28 and 685 is: 1,027.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,839.52 : 2,759.28 = 685 : x
  2. Step 2: Convert to fraction form
    1,839.52/2,759.28 = 685/x
  3. Step 3: Cross multiply
    1,839.52x = 2,759.28 × 685
  4. Step 4: Simplify right side
    1,839.52x = 1,890,106.80
  5. Step 5: Solve for x
    x = 1,890,106.80/1,839.52
  6. Step 6: Final answer
    x = 1,027.50

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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.