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Finding the Fourth Proportional to 172.11, 258.06 and 85.25

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Solution

The fourth proportional to 172.11, 258.06 and 85.25 is: 127.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.11 : 258.06 = 85.25 : x
  2. Step 2: Convert to fraction form
    172.11/258.06 = 85.25/x
  3. Step 3: Cross multiply
    172.11x = 258.06 × 85.25
  4. Step 4: Simplify right side
    172.11x = 22,000.26
  5. Step 5: Solve for x
    x = 22,000.26/172.11
  6. Step 6: Final answer
    x = 127.83

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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.