Home / 1,986.66-2,742.30-1,200.78

Finding the Fourth Proportional to 1,986.66, 2,742.30 and 1,200.78

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Solution

The fourth proportional to 1,986.66, 2,742.30 and 1,200.78 is: 1,657.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.66 : 2,742.30 = 1,200.78 : x
  2. Step 2: Convert to fraction form
    1,986.66/2,742.30 = 1,200.78/x
  3. Step 3: Cross multiply
    1,986.66x = 2,742.30 × 1,200.78
  4. Step 4: Simplify right side
    1,986.66x = 3,292,898.99
  5. Step 5: Solve for x
    x = 3,292,898.99/1,986.66
  6. Step 6: Final answer
    x = 1,657.51

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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.