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Finding the Fourth Proportional to 119,687.31, 165,107.79 and 91,343.79

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Solution

The fourth proportional to 119,687.31, 165,107.79 and 91,343.79 is: 126,008.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,687.31 : 165,107.79 = 91,343.79 : x
  2. Step 2: Convert to fraction form
    119,687.31/165,107.79 = 91,343.79/x
  3. Step 3: Cross multiply
    119,687.31x = 165,107.79 × 91,343.79
  4. Step 4: Simplify right side
    119,687.31x = 15,081,571,297.12
  5. Step 5: Solve for x
    x = 15,081,571,297.12/119,687.31
  6. Step 6: Final answer
    x = 126,008.11

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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.