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Finding the Fourth Proportional to 66,321.54, 99,469.35 and 19,561.86

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Solution

The fourth proportional to 66,321.54, 99,469.35 and 19,561.86 is: 29,338.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,321.54 : 99,469.35 = 19,561.86 : x
  2. Step 2: Convert to fraction form
    66,321.54/99,469.35 = 19,561.86/x
  3. Step 3: Cross multiply
    66,321.54x = 99,469.35 × 19,561.86
  4. Step 4: Simplify right side
    66,321.54x = 1,945,805,498.99
  5. Step 5: Solve for x
    x = 1,945,805,498.99/66,321.54
  6. Step 6: Final answer
    x = 29,338.97

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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.