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Finding the Fourth Proportional to 81,161.90, 121,779.30 and 36,765.80

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Solution

The fourth proportional to 81,161.90, 121,779.30 and 36,765.80 is: 55,165.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,161.90 : 121,779.30 = 36,765.80 : x
  2. Step 2: Convert to fraction form
    81,161.90/121,779.30 = 36,765.80/x
  3. Step 3: Cross multiply
    81,161.90x = 121,779.30 × 36,765.80
  4. Step 4: Simplify right side
    81,161.90x = 4,477,313,387.94
  5. Step 5: Solve for x
    x = 4,477,313,387.94/81,161.90
  6. Step 6: Final answer
    x = 55,165.21

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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.