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Finding the Fourth Proportional to 172.12, 258.29 and 69.48

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Solution

The fourth proportional to 172.12, 258.29 and 69.48 is: 104.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.12 : 258.29 = 69.48 : x
  2. Step 2: Convert to fraction form
    172.12/258.29 = 69.48/x
  3. Step 3: Cross multiply
    172.12x = 258.29 × 69.48
  4. Step 4: Simplify right side
    172.12x = 17,945.99
  5. Step 5: Solve for x
    x = 17,945.99/172.12
  6. Step 6: Final answer
    x = 104.26

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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.