Home / 1,991.99-2,749.70-1,328.60

Finding the Fourth Proportional to 1,991.99, 2,749.70 and 1,328.60

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Solution

The fourth proportional to 1,991.99, 2,749.70 and 1,328.60 is: 1,833.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.99 : 2,749.70 = 1,328.60 : x
  2. Step 2: Convert to fraction form
    1,991.99/2,749.70 = 1,328.60/x
  3. Step 3: Cross multiply
    1,991.99x = 2,749.70 × 1,328.60
  4. Step 4: Simplify right side
    1,991.99x = 3,653,231.03
  5. Step 5: Solve for x
    x = 3,653,231.03/1,991.99
  6. Step 6: Final answer
    x = 1,833.97

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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.