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Finding the Fourth Proportional to 71,920.55, 107,917.80 and 55,161.22

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Solution

The fourth proportional to 71,920.55, 107,917.80 and 55,161.22 is: 82,770.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,920.55 : 107,917.80 = 55,161.22 : x
  2. Step 2: Convert to fraction form
    71,920.55/107,917.80 = 55,161.22/x
  3. Step 3: Cross multiply
    71,920.55x = 107,917.80 × 55,161.22
  4. Step 4: Simplify right side
    71,920.55x = 5,952,877,507.72
  5. Step 5: Solve for x
    x = 5,952,877,507.72/71,920.55
  6. Step 6: Final answer
    x = 82,770.19

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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.