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Finding the Fourth Proportional to 66,879, 100,295.28 and 19,481.31

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Solution

The fourth proportional to 66,879, 100,295.28 and 19,481.31 is: 29,215.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,879 : 100,295.28 = 19,481.31 : x
  2. Step 2: Convert to fraction form
    66,879/100,295.28 = 19,481.31/x
  3. Step 3: Cross multiply
    66,879x = 100,295.28 × 19,481.31
  4. Step 4: Simplify right side
    66,879x = 1,953,883,441.22
  5. Step 5: Solve for x
    x = 1,953,883,441.22/66,879
  6. Step 6: Final answer
    x = 29,215.20

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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.