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Finding the Fourth Proportional to 18,021.80, 27,008.40 and 12,081.80

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Solution

The fourth proportional to 18,021.80, 27,008.40 and 12,081.80 is: 18,106.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,021.80 : 27,008.40 = 12,081.80 : x
  2. Step 2: Convert to fraction form
    18,021.80/27,008.40 = 12,081.80/x
  3. Step 3: Cross multiply
    18,021.80x = 27,008.40 × 12,081.80
  4. Step 4: Simplify right side
    18,021.80x = 326,310,087.12
  5. Step 5: Solve for x
    x = 326,310,087.12/18,021.80
  6. Step 6: Final answer
    x = 18,106.41

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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.