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Finding the Fourth Proportional to 172.96, 238.67 and 136.21

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Solution

The fourth proportional to 172.96, 238.67 and 136.21 is: 187.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.96 : 238.67 = 136.21 : x
  2. Step 2: Convert to fraction form
    172.96/238.67 = 136.21/x
  3. Step 3: Cross multiply
    172.96x = 238.67 × 136.21
  4. Step 4: Simplify right side
    172.96x = 32,509.24
  5. Step 5: Solve for x
    x = 32,509.24/172.96
  6. Step 6: Final answer
    x = 187.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.