Home / 1,857.21-2,781.36-1,309.65

Finding the Fourth Proportional to 1,857.21, 2,781.36 and 1,309.65

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Solution

The fourth proportional to 1,857.21, 2,781.36 and 1,309.65 is: 1,961.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.21 : 2,781.36 = 1,309.65 : x
  2. Step 2: Convert to fraction form
    1,857.21/2,781.36 = 1,309.65/x
  3. Step 3: Cross multiply
    1,857.21x = 2,781.36 × 1,309.65
  4. Step 4: Simplify right side
    1,857.21x = 3,642,608.12
  5. Step 5: Solve for x
    x = 3,642,608.12/1,857.21
  6. Step 6: Final answer
    x = 1,961.33

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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.