Home / 1,986.19-2,741.01-1,288.78

Finding the Fourth Proportional to 1,986.19, 2,741.01 and 1,288.78

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Solution

The fourth proportional to 1,986.19, 2,741.01 and 1,288.78 is: 1,778.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.19 : 2,741.01 = 1,288.78 : x
  2. Step 2: Convert to fraction form
    1,986.19/2,741.01 = 1,288.78/x
  3. Step 3: Cross multiply
    1,986.19x = 2,741.01 × 1,288.78
  4. Step 4: Simplify right side
    1,986.19x = 3,532,547.18
  5. Step 5: Solve for x
    x = 3,532,547.18/1,986.19
  6. Step 6: Final answer
    x = 1,778.56

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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.