Home / 1,291.14-1,921.19-1,286.82

Finding the Fourth Proportional to 1,291.14, 1,921.19 and 1,286.82

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Solution

The fourth proportional to 1,291.14, 1,921.19 and 1,286.82 is: 1,914.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.14 : 1,921.19 = 1,286.82 : x
  2. Step 2: Convert to fraction form
    1,291.14/1,921.19 = 1,286.82/x
  3. Step 3: Cross multiply
    1,291.14x = 1,921.19 × 1,286.82
  4. Step 4: Simplify right side
    1,291.14x = 2,472,219.28
  5. Step 5: Solve for x
    x = 2,472,219.28/1,291.14
  6. Step 6: Final answer
    x = 1,914.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.