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Finding the Fourth Proportional to 81,195.30, 121,812.15 and 25,791.30

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Solution

The fourth proportional to 81,195.30, 121,812.15 and 25,791.30 is: 38,693.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,195.30 : 121,812.15 = 25,791.30 : x
  2. Step 2: Convert to fraction form
    81,195.30/121,812.15 = 25,791.30/x
  3. Step 3: Cross multiply
    81,195.30x = 121,812.15 × 25,791.30
  4. Step 4: Simplify right side
    81,195.30x = 3,141,693,704.30
  5. Step 5: Solve for x
    x = 3,141,693,704.30/81,195.30
  6. Step 6: Final answer
    x = 38,693.05

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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.