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Finding the Fourth Proportional to 172,717.85, 258,965.51 and 72,851.33

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Solution

The fourth proportional to 172,717.85, 258,965.51 and 72,851.33 is: 109,230.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,717.85 : 258,965.51 = 72,851.33 : x
  2. Step 2: Convert to fraction form
    172,717.85/258,965.51 = 72,851.33/x
  3. Step 3: Cross multiply
    172,717.85x = 258,965.51 × 72,851.33
  4. Step 4: Simplify right side
    172,717.85x = 18,865,982,110.79
  5. Step 5: Solve for x
    x = 18,865,982,110.79/172,717.85
  6. Step 6: Final answer
    x = 109,230.06

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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.