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Finding the Fourth Proportional to 172,712.28, 259,103.34 and 72,872.68

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Solution

The fourth proportional to 172,712.28, 259,103.34 and 72,872.68 is: 109,323.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,712.28 : 259,103.34 = 72,872.68 : x
  2. Step 2: Convert to fraction form
    172,712.28/259,103.34 = 72,872.68/x
  3. Step 3: Cross multiply
    172,712.28x = 259,103.34 × 72,872.68
  4. Step 4: Simplify right side
    172,712.28x = 18,881,554,782.75
  5. Step 5: Solve for x
    x = 18,881,554,782.75/172,712.28
  6. Step 6: Final answer
    x = 109,323.75

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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.