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Finding the Fourth Proportional to 18,021.76, 27,021 and 7,499.04

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Solution

The fourth proportional to 18,021.76, 27,021 and 7,499.04 is: 11,243.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,021.76 : 27,021 = 7,499.04 : x
  2. Step 2: Convert to fraction form
    18,021.76/27,021 = 7,499.04/x
  3. Step 3: Cross multiply
    18,021.76x = 27,021 × 7,499.04
  4. Step 4: Simplify right side
    18,021.76x = 202,631,559.84
  5. Step 5: Solve for x
    x = 202,631,559.84/18,021.76
  6. Step 6: Final answer
    x = 11,243.72

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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.