Home / 1,378.19-2,077.61-1,286.54

Finding the Fourth Proportional to 1,378.19, 2,077.61 and 1,286.54

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Solution

The fourth proportional to 1,378.19, 2,077.61 and 1,286.54 is: 1,939.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.19 : 2,077.61 = 1,286.54 : x
  2. Step 2: Convert to fraction form
    1,378.19/2,077.61 = 1,286.54/x
  3. Step 3: Cross multiply
    1,378.19x = 2,077.61 × 1,286.54
  4. Step 4: Simplify right side
    1,378.19x = 2,672,935.30
  5. Step 5: Solve for x
    x = 2,672,935.30/1,378.19
  6. Step 6: Final answer
    x = 1,939.45

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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.