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Finding the Fourth Proportional to 101,988.72, 140,759.64 and 80,429.04

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Solution

The fourth proportional to 101,988.72, 140,759.64 and 80,429.04 is: 111,004.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,988.72 : 140,759.64 = 80,429.04 : x
  2. Step 2: Convert to fraction form
    101,988.72/140,759.64 = 80,429.04/x
  3. Step 3: Cross multiply
    101,988.72x = 140,759.64 × 80,429.04
  4. Step 4: Simplify right side
    101,988.72x = 11,321,162,715.95
  5. Step 5: Solve for x
    x = 11,321,162,715.95/101,988.72
  6. Step 6: Final answer
    x = 111,004.07

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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.