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Finding the Fourth Proportional to 123,609.33, 170,608.73 and 72,638.44

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Solution

The fourth proportional to 123,609.33, 170,608.73 and 72,638.44 is: 100,257.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,609.33 : 170,608.73 = 72,638.44 : x
  2. Step 2: Convert to fraction form
    123,609.33/170,608.73 = 72,638.44/x
  3. Step 3: Cross multiply
    123,609.33x = 170,608.73 × 72,638.44
  4. Step 4: Simplify right side
    123,609.33x = 12,392,751,207.87
  5. Step 5: Solve for x
    x = 12,392,751,207.87/123,609.33
  6. Step 6: Final answer
    x = 100,257.41

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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.