Home / 1,990.38-2,744.64-1,393.40

Finding the Fourth Proportional to 1,990.38, 2,744.64 and 1,393.40

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Solution

The fourth proportional to 1,990.38, 2,744.64 and 1,393.40 is: 1,921.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.38 : 2,744.64 = 1,393.40 : x
  2. Step 2: Convert to fraction form
    1,990.38/2,744.64 = 1,393.40/x
  3. Step 3: Cross multiply
    1,990.38x = 2,744.64 × 1,393.40
  4. Step 4: Simplify right side
    1,990.38x = 3,824,381.38
  5. Step 5: Solve for x
    x = 3,824,381.38/1,990.38
  6. Step 6: Final answer
    x = 1,921.43

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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.