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Finding the Fourth Proportional to 172,918.80, 259,426.80 and 84,175.20

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Solution

The fourth proportional to 172,918.80, 259,426.80 and 84,175.20 is: 126,286.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,918.80 : 259,426.80 = 84,175.20 : x
  2. Step 2: Convert to fraction form
    172,918.80/259,426.80 = 84,175.20/x
  3. Step 3: Cross multiply
    172,918.80x = 259,426.80 × 84,175.20
  4. Step 4: Simplify right side
    172,918.80x = 21,837,302,775.36
  5. Step 5: Solve for x
    x = 21,837,302,775.36/172,918.80
  6. Step 6: Final answer
    x = 126,286.46

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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.