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Finding the Fourth Proportional to 2,759.49, 4,139.86 and 910.79

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Solution

The fourth proportional to 2,759.49, 4,139.86 and 910.79 is: 1,366.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,759.49 : 4,139.86 = 910.79 : x
  2. Step 2: Convert to fraction form
    2,759.49/4,139.86 = 910.79/x
  3. Step 3: Cross multiply
    2,759.49x = 4,139.86 × 910.79
  4. Step 4: Simplify right side
    2,759.49x = 3,770,543.09
  5. Step 5: Solve for x
    x = 3,770,543.09/2,759.49
  6. Step 6: Final answer
    x = 1,366.39

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1.5x scale

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.