Home / 1,990.17-2,986.30-1,112.13

Finding the Fourth Proportional to 1,990.17, 2,986.30 and 1,112.13

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Solution

The fourth proportional to 1,990.17, 2,986.30 and 1,112.13 is: 1,668.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.17 : 2,986.30 = 1,112.13 : x
  2. Step 2: Convert to fraction form
    1,990.17/2,986.30 = 1,112.13/x
  3. Step 3: Cross multiply
    1,990.17x = 2,986.30 × 1,112.13
  4. Step 4: Simplify right side
    1,990.17x = 3,321,153.82
  5. Step 5: Solve for x
    x = 3,321,153.82/1,990.17
  6. Step 6: Final answer
    x = 1,668.78

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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.