Home / 1,943.30-2,912.16-1,121.78

Finding the Fourth Proportional to 1,943.30, 2,912.16 and 1,121.78

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Solution

The fourth proportional to 1,943.30, 2,912.16 and 1,121.78 is: 1,681.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,943.30 : 2,912.16 = 1,121.78 : x
  2. Step 2: Convert to fraction form
    1,943.30/2,912.16 = 1,121.78/x
  3. Step 3: Cross multiply
    1,943.30x = 2,912.16 × 1,121.78
  4. Step 4: Simplify right side
    1,943.30x = 3,266,802.84
  5. Step 5: Solve for x
    x = 3,266,802.84/1,943.30
  6. Step 6: Final answer
    x = 1,681.06

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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.