Home / 1,985.42-2,738.67-1,286.80

Finding the Fourth Proportional to 1,985.42, 2,738.67 and 1,286.80

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Solution

The fourth proportional to 1,985.42, 2,738.67 and 1,286.80 is: 1,775.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.42 : 2,738.67 = 1,286.80 : x
  2. Step 2: Convert to fraction form
    1,985.42/2,738.67 = 1,286.80/x
  3. Step 3: Cross multiply
    1,985.42x = 2,738.67 × 1,286.80
  4. Step 4: Simplify right side
    1,985.42x = 3,524,120.56
  5. Step 5: Solve for x
    x = 3,524,120.56/1,985.42
  6. Step 6: Final answer
    x = 1,775.00

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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.