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Finding the Fourth Proportional to 1,991.05, 2,747.12 and 1,246.12

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Solution

The fourth proportional to 1,991.05, 2,747.12 and 1,246.12 is: 1,719.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.05 : 2,747.12 = 1,246.12 : x
  2. Step 2: Convert to fraction form
    1,991.05/2,747.12 = 1,246.12/x
  3. Step 3: Cross multiply
    1,991.05x = 2,747.12 × 1,246.12
  4. Step 4: Simplify right side
    1,991.05x = 3,423,228.08
  5. Step 5: Solve for x
    x = 3,423,228.08/1,991.05
  6. Step 6: Final answer
    x = 1,719.31

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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.