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Finding the Fourth Proportional to 172,663.80, 258,995.70 and 72,936.60

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Solution

The fourth proportional to 172,663.80, 258,995.70 and 72,936.60 is: 109,404.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,663.80 : 258,995.70 = 72,936.60 : x
  2. Step 2: Convert to fraction form
    172,663.80/258,995.70 = 72,936.60/x
  3. Step 3: Cross multiply
    172,663.80x = 258,995.70 × 72,936.60
  4. Step 4: Simplify right side
    172,663.80x = 18,890,265,772.62
  5. Step 5: Solve for x
    x = 18,890,265,772.62/172,663.80
  6. Step 6: Final answer
    x = 109,404.90

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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.