Home / 107,821.20-161,731.80-85,270.80

Finding the Fourth Proportional to 107,821.20, 161,731.80 and 85,270.80

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Solution

The fourth proportional to 107,821.20, 161,731.80 and 85,270.80 is: 127,906.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,821.20 : 161,731.80 = 85,270.80 : x
  2. Step 2: Convert to fraction form
    107,821.20/161,731.80 = 85,270.80/x
  3. Step 3: Cross multiply
    107,821.20x = 161,731.80 × 85,270.80
  4. Step 4: Simplify right side
    107,821.20x = 13,790,999,971.44
  5. Step 5: Solve for x
    x = 13,790,999,971.44/107,821.20
  6. Step 6: Final answer
    x = 127,906.20

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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.