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Finding the Fourth Proportional to 172,665.80, 258,998.70 and 72,938.60

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Solution

The fourth proportional to 172,665.80, 258,998.70 and 72,938.60 is: 109,407.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,665.80 : 258,998.70 = 72,938.60 : x
  2. Step 2: Convert to fraction form
    172,665.80/258,998.70 = 72,938.60/x
  3. Step 3: Cross multiply
    172,665.80x = 258,998.70 × 72,938.60
  4. Step 4: Simplify right side
    172,665.80x = 18,891,002,579.82
  5. Step 5: Solve for x
    x = 18,891,002,579.82/172,665.80
  6. Step 6: Final answer
    x = 109,407.90

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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.