Home / 1,991.35-2,747.95-1,107.19

Finding the Fourth Proportional to 1,991.35, 2,747.95 and 1,107.19

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Solution

The fourth proportional to 1,991.35, 2,747.95 and 1,107.19 is: 1,527.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.35 : 2,747.95 = 1,107.19 : x
  2. Step 2: Convert to fraction form
    1,991.35/2,747.95 = 1,107.19/x
  3. Step 3: Cross multiply
    1,991.35x = 2,747.95 × 1,107.19
  4. Step 4: Simplify right side
    1,991.35x = 3,042,502.76
  5. Step 5: Solve for x
    x = 3,042,502.76/1,991.35
  6. Step 6: Final answer
    x = 1,527.86

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.