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Finding the Fourth Proportional to 172.58, 238.17 and 120.11

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Solution

The fourth proportional to 172.58, 238.17 and 120.11 is: 165.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.58 : 238.17 = 120.11 : x
  2. Step 2: Convert to fraction form
    172.58/238.17 = 120.11/x
  3. Step 3: Cross multiply
    172.58x = 238.17 × 120.11
  4. Step 4: Simplify right side
    172.58x = 28,605.41
  5. Step 5: Solve for x
    x = 28,605.41/172.58
  6. Step 6: Final answer
    x = 165.76

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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.