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Finding the Fourth Proportional to 172.34, 258.42 and 126.80

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Solution

The fourth proportional to 172.34, 258.42 and 126.80 is: 190.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.34 : 258.42 = 126.80 : x
  2. Step 2: Convert to fraction form
    172.34/258.42 = 126.80/x
  3. Step 3: Cross multiply
    172.34x = 258.42 × 126.80
  4. Step 4: Simplify right side
    172.34x = 32,767.66
  5. Step 5: Solve for x
    x = 32,767.66/172.34
  6. Step 6: Final answer
    x = 190.13

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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.