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Finding the Fourth Proportional to 18,620.40, 27,914.40 and 11,227.80

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Solution

The fourth proportional to 18,620.40, 27,914.40 and 11,227.80 is: 16,831.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.40 : 27,914.40 = 11,227.80 : x
  2. Step 2: Convert to fraction form
    18,620.40/27,914.40 = 11,227.80/x
  3. Step 3: Cross multiply
    18,620.40x = 27,914.40 × 11,227.80
  4. Step 4: Simplify right side
    18,620.40x = 313,417,300.32
  5. Step 5: Solve for x
    x = 313,417,300.32/18,620.40
  6. Step 6: Final answer
    x = 16,831.93

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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.