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Finding the Fourth Proportional to 172.69, 258.05 and 131.33

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Solution

The fourth proportional to 172.69, 258.05 and 131.33 is: 196.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.69 : 258.05 = 131.33 : x
  2. Step 2: Convert to fraction form
    172.69/258.05 = 131.33/x
  3. Step 3: Cross multiply
    172.69x = 258.05 × 131.33
  4. Step 4: Simplify right side
    172.69x = 33,887.76
  5. Step 5: Solve for x
    x = 33,887.76/172.69
  6. Step 6: Final answer
    x = 196.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.