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Finding the Fourth Proportional to 66,491.40, 99,653.94 and 33,220.78

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Solution

The fourth proportional to 66,491.40, 99,653.94 and 33,220.78 is: 49,789.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,491.40 : 99,653.94 = 33,220.78 : x
  2. Step 2: Convert to fraction form
    66,491.40/99,653.94 = 33,220.78/x
  3. Step 3: Cross multiply
    66,491.40x = 99,653.94 × 33,220.78
  4. Step 4: Simplify right side
    66,491.40x = 3,310,581,616.87
  5. Step 5: Solve for x
    x = 3,310,581,616.87/66,491.40
  6. Step 6: Final answer
    x = 49,789.62

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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.