Home / 12,187.36-18,286.74-11,990.80

Finding the Fourth Proportional to 12,187.36, 18,286.74 and 11,990.80

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Solution

The fourth proportional to 12,187.36, 18,286.74 and 11,990.80 is: 17,991.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,187.36 : 18,286.74 = 11,990.80 : x
  2. Step 2: Convert to fraction form
    12,187.36/18,286.74 = 11,990.80/x
  3. Step 3: Cross multiply
    12,187.36x = 18,286.74 × 11,990.80
  4. Step 4: Simplify right side
    12,187.36x = 219,272,641.99
  5. Step 5: Solve for x
    x = 219,272,641.99/12,187.36
  6. Step 6: Final answer
    x = 17,991.81

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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.