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Finding the Fourth Proportional to 66,987.60, 100,308.60 and 53,163.60

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Solution

The fourth proportional to 66,987.60, 100,308.60 and 53,163.60 is: 79,608.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,987.60 : 100,308.60 = 53,163.60 : x
  2. Step 2: Convert to fraction form
    66,987.60/100,308.60 = 53,163.60/x
  3. Step 3: Cross multiply
    66,987.60x = 100,308.60 × 53,163.60
  4. Step 4: Simplify right side
    66,987.60x = 5,332,766,286.96
  5. Step 5: Solve for x
    x = 5,332,766,286.96/66,987.60
  6. Step 6: Final answer
    x = 79,608.26

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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.