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Finding the Fourth Proportional to 66,129.80, 99,201.24 and 21,738.56

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Solution

The fourth proportional to 66,129.80, 99,201.24 and 21,738.56 is: 32,609.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,129.80 : 99,201.24 = 21,738.56 : x
  2. Step 2: Convert to fraction form
    66,129.80/99,201.24 = 21,738.56/x
  3. Step 3: Cross multiply
    66,129.80x = 99,201.24 × 21,738.56
  4. Step 4: Simplify right side
    66,129.80x = 2,156,492,107.81
  5. Step 5: Solve for x
    x = 2,156,492,107.81/66,129.80
  6. Step 6: Final answer
    x = 32,609.99

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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.