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Finding the Fourth Proportional to 172,689.90, 259,062.52 and 72,864.78

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Solution

The fourth proportional to 172,689.90, 259,062.52 and 72,864.78 is: 109,308.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,689.90 : 259,062.52 = 72,864.78 : x
  2. Step 2: Convert to fraction form
    172,689.90/259,062.52 = 72,864.78/x
  3. Step 3: Cross multiply
    172,689.90x = 259,062.52 × 72,864.78
  4. Step 4: Simplify right side
    172,689.90x = 18,876,533,526.05
  5. Step 5: Solve for x
    x = 18,876,533,526.05/172,689.90
  6. Step 6: Final answer
    x = 109,308.85

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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.