Home / 20,808.09-31,185.30-18,128.82

Finding the Fourth Proportional to 20,808.09, 31,185.30 and 18,128.82

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Solution

The fourth proportional to 20,808.09, 31,185.30 and 18,128.82 is: 27,169.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.09 : 31,185.30 = 18,128.82 : x
  2. Step 2: Convert to fraction form
    20,808.09/31,185.30 = 18,128.82/x
  3. Step 3: Cross multiply
    20,808.09x = 31,185.30 × 18,128.82
  4. Step 4: Simplify right side
    20,808.09x = 565,352,690.35
  5. Step 5: Solve for x
    x = 565,352,690.35/20,808.09
  6. Step 6: Final answer
    x = 27,169.85

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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.