Home / 1,990.24-2,986.40-1,170.11

Finding the Fourth Proportional to 1,990.24, 2,986.40 and 1,170.11

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Solution

The fourth proportional to 1,990.24, 2,986.40 and 1,170.11 is: 1,755.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.24 : 2,986.40 = 1,170.11 : x
  2. Step 2: Convert to fraction form
    1,990.24/2,986.40 = 1,170.11/x
  3. Step 3: Cross multiply
    1,990.24x = 2,986.40 × 1,170.11
  4. Step 4: Simplify right side
    1,990.24x = 3,494,426.90
  5. Step 5: Solve for x
    x = 3,494,426.90/1,990.24
  6. Step 6: Final answer
    x = 1,755.78

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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.