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Finding the Fourth Proportional to 172.56, 238.08 and 120.72

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Solution

The fourth proportional to 172.56, 238.08 and 120.72 is: 166.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.56 : 238.08 = 120.72 : x
  2. Step 2: Convert to fraction form
    172.56/238.08 = 120.72/x
  3. Step 3: Cross multiply
    172.56x = 238.08 × 120.72
  4. Step 4: Simplify right side
    172.56x = 28,741.02
  5. Step 5: Solve for x
    x = 28,741.02/172.56
  6. Step 6: Final answer
    x = 166.56

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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.