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Finding the Fourth Proportional to 66,469.72, 99,705.20 and 19,722.60

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Solution

The fourth proportional to 66,469.72, 99,705.20 and 19,722.60 is: 29,584.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,469.72 : 99,705.20 = 19,722.60 : x
  2. Step 2: Convert to fraction form
    66,469.72/99,705.20 = 19,722.60/x
  3. Step 3: Cross multiply
    66,469.72x = 99,705.20 × 19,722.60
  4. Step 4: Simplify right side
    66,469.72x = 1,966,445,777.52
  5. Step 5: Solve for x
    x = 1,966,445,777.52/66,469.72
  6. Step 6: Final answer
    x = 29,584.08

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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.