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Finding the Fourth Proportional to 2,660.99, 3,991.49 and 812.12

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Solution

The fourth proportional to 2,660.99, 3,991.49 and 812.12 is: 1,218.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.99 : 3,991.49 = 812.12 : x
  2. Step 2: Convert to fraction form
    2,660.99/3,991.49 = 812.12/x
  3. Step 3: Cross multiply
    2,660.99x = 3,991.49 × 812.12
  4. Step 4: Simplify right side
    2,660.99x = 3,241,555.37
  5. Step 5: Solve for x
    x = 3,241,555.37/2,660.99
  6. Step 6: Final answer
    x = 1,218.18

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Double scale
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Similar ratio
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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.