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Finding the Fourth Proportional to 123,909.63, 170,999.01 and 87,676.04

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Solution

The fourth proportional to 123,909.63, 170,999.01 and 87,676.04 is: 120,995.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,909.63 : 170,999.01 = 87,676.04 : x
  2. Step 2: Convert to fraction form
    123,909.63/170,999.01 = 87,676.04/x
  3. Step 3: Cross multiply
    123,909.63x = 170,999.01 × 87,676.04
  4. Step 4: Simplify right side
    123,909.63x = 14,992,515,185.73
  5. Step 5: Solve for x
    x = 14,992,515,185.73/123,909.63
  6. Step 6: Final answer
    x = 120,995.56

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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.