Home / 2,158.20-3,238.96-859.80

Finding the Fourth Proportional to 2,158.20, 3,238.96 and 859.80

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Solution

The fourth proportional to 2,158.20, 3,238.96 and 859.80 is: 1,290.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.20 : 3,238.96 = 859.80 : x
  2. Step 2: Convert to fraction form
    2,158.20/3,238.96 = 859.80/x
  3. Step 3: Cross multiply
    2,158.20x = 3,238.96 × 859.80
  4. Step 4: Simplify right side
    2,158.20x = 2,784,857.81
  5. Step 5: Solve for x
    x = 2,784,857.81/2,158.20
  6. Step 6: Final answer
    x = 1,290.36

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1.5x scale

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.