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Finding the Fourth Proportional to 107,859.20, 161,821.20 and 76,755.20

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Solution

The fourth proportional to 107,859.20, 161,821.20 and 76,755.20 is: 115,155.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,859.20 : 161,821.20 = 76,755.20 : x
  2. Step 2: Convert to fraction form
    107,859.20/161,821.20 = 76,755.20/x
  3. Step 3: Cross multiply
    107,859.20x = 161,821.20 × 76,755.20
  4. Step 4: Simplify right side
    107,859.20x = 12,420,618,570.24
  5. Step 5: Solve for x
    x = 12,420,618,570.24/107,859.20
  6. Step 6: Final answer
    x = 115,155.86

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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.