Home / 1,986.02-2,739.44-1,278.78

Finding the Fourth Proportional to 1,986.02, 2,739.44 and 1,278.78

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Solution

The fourth proportional to 1,986.02, 2,739.44 and 1,278.78 is: 1,763.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.02 : 2,739.44 = 1,278.78 : x
  2. Step 2: Convert to fraction form
    1,986.02/2,739.44 = 1,278.78/x
  3. Step 3: Cross multiply
    1,986.02x = 2,739.44 × 1,278.78
  4. Step 4: Simplify right side
    1,986.02x = 3,503,141.08
  5. Step 5: Solve for x
    x = 3,503,141.08/1,986.02
  6. Step 6: Final answer
    x = 1,763.90

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1.5x scale

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.