Home / 3,928.39-5,421.09-2,135.83

Finding the Fourth Proportional to 3,928.39, 5,421.09 and 2,135.83

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Solution

The fourth proportional to 3,928.39, 5,421.09 and 2,135.83 is: 2,947.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.39 : 5,421.09 = 2,135.83 : x
  2. Step 2: Convert to fraction form
    3,928.39/5,421.09 = 2,135.83/x
  3. Step 3: Cross multiply
    3,928.39x = 5,421.09 × 2,135.83
  4. Step 4: Simplify right side
    3,928.39x = 11,578,526.65
  5. Step 5: Solve for x
    x = 11,578,526.65/3,928.39
  6. Step 6: Final answer
    x = 2,947.40

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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.