Home / 1,921.05-2,649.24-1,290.87

Finding the Fourth Proportional to 1,921.05, 2,649.24 and 1,290.87

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Solution

The fourth proportional to 1,921.05, 2,649.24 and 1,290.87 is: 1,780.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.05 : 2,649.24 = 1,290.87 : x
  2. Step 2: Convert to fraction form
    1,921.05/2,649.24 = 1,290.87/x
  3. Step 3: Cross multiply
    1,921.05x = 2,649.24 × 1,290.87
  4. Step 4: Simplify right side
    1,921.05x = 3,419,824.44
  5. Step 5: Solve for x
    x = 3,419,824.44/1,921.05
  6. Step 6: Final answer
    x = 1,780.19

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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.