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Finding the Fourth Proportional to 66,405.13, 99,627.20 and 19,659.22

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Solution

The fourth proportional to 66,405.13, 99,627.20 and 19,659.22 is: 29,494.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,405.13 : 99,627.20 = 19,659.22 : x
  2. Step 2: Convert to fraction form
    66,405.13/99,627.20 = 19,659.22/x
  3. Step 3: Cross multiply
    66,405.13x = 99,627.20 × 19,659.22
  4. Step 4: Simplify right side
    66,405.13x = 1,958,593,042.78
  5. Step 5: Solve for x
    x = 1,958,593,042.78/66,405.13
  6. Step 6: Final answer
    x = 29,494.60

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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.