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Finding the Fourth Proportional to 18,172.80, 27,215.46 and 12,311.64

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Solution

The fourth proportional to 18,172.80, 27,215.46 and 12,311.64 is: 18,437.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,172.80 : 27,215.46 = 12,311.64 : x
  2. Step 2: Convert to fraction form
    18,172.80/27,215.46 = 12,311.64/x
  3. Step 3: Cross multiply
    18,172.80x = 27,215.46 × 12,311.64
  4. Step 4: Simplify right side
    18,172.80x = 335,066,945.95
  5. Step 5: Solve for x
    x = 335,066,945.95/18,172.80
  6. Step 6: Final answer
    x = 18,437.83

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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.