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Finding the Fourth Proportional to 79,231.86, 109,340.81 and 43,421.09

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Solution

The fourth proportional to 79,231.86, 109,340.81 and 43,421.09 is: 59,921.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,231.86 : 109,340.81 = 43,421.09 : x
  2. Step 2: Convert to fraction form
    79,231.86/109,340.81 = 43,421.09/x
  3. Step 3: Cross multiply
    79,231.86x = 109,340.81 × 43,421.09
  4. Step 4: Simplify right side
    79,231.86x = 4,747,696,387.87
  5. Step 5: Solve for x
    x = 4,747,696,387.87/79,231.86
  6. Step 6: Final answer
    x = 59,921.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.