Home / 1,286.12-1,939.18-1,178.12

Finding the Fourth Proportional to 1,286.12, 1,939.18 and 1,178.12

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Solution

The fourth proportional to 1,286.12, 1,939.18 and 1,178.12 is: 1,776.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.12 : 1,939.18 = 1,178.12 : x
  2. Step 2: Convert to fraction form
    1,286.12/1,939.18 = 1,178.12/x
  3. Step 3: Cross multiply
    1,286.12x = 1,939.18 × 1,178.12
  4. Step 4: Simplify right side
    1,286.12x = 2,284,586.74
  5. Step 5: Solve for x
    x = 2,284,586.74/1,286.12
  6. Step 6: Final answer
    x = 1,776.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.