Home / 5,286.21-7,928.71-1,390.92

Finding the Fourth Proportional to 5,286.21, 7,928.71 and 1,390.92

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Solution

The fourth proportional to 5,286.21, 7,928.71 and 1,390.92 is: 2,086.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,286.21 : 7,928.71 = 1,390.92 : x
  2. Step 2: Convert to fraction form
    5,286.21/7,928.71 = 1,390.92/x
  3. Step 3: Cross multiply
    5,286.21x = 7,928.71 × 1,390.92
  4. Step 4: Simplify right side
    5,286.21x = 11,028,201.31
  5. Step 5: Solve for x
    x = 11,028,201.31/5,286.21
  6. Step 6: Final answer
    x = 2,086.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.