Home / 1,912.20-2,642.79-1,561.06

Finding the Fourth Proportional to 1,912.20, 2,642.79 and 1,561.06

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Solution

The fourth proportional to 1,912.20, 2,642.79 and 1,561.06 is: 2,157.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.20 : 2,642.79 = 1,561.06 : x
  2. Step 2: Convert to fraction form
    1,912.20/2,642.79 = 1,561.06/x
  3. Step 3: Cross multiply
    1,912.20x = 2,642.79 × 1,561.06
  4. Step 4: Simplify right side
    1,912.20x = 4,125,553.76
  5. Step 5: Solve for x
    x = 4,125,553.76/1,912.20
  6. Step 6: Final answer
    x = 2,157.49

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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.