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Finding the Fourth Proportional to 1,839.20, 2,758.79 and 684.95

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Solution

The fourth proportional to 1,839.20, 2,758.79 and 684.95 is: 1,027.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,839.20 : 2,758.79 = 684.95 : x
  2. Step 2: Convert to fraction form
    1,839.20/2,758.79 = 684.95/x
  3. Step 3: Cross multiply
    1,839.20x = 2,758.79 × 684.95
  4. Step 4: Simplify right side
    1,839.20x = 1,889,615.99
  5. Step 5: Solve for x
    x = 1,889,615.99/1,839.20
  6. Step 6: Final answer
    x = 1,027.41

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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.