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Finding the Fourth Proportional to 172.96, 257.32 and 162.72

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Solution

The fourth proportional to 172.96, 257.32 and 162.72 is: 242.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.96 : 257.32 = 162.72 : x
  2. Step 2: Convert to fraction form
    172.96/257.32 = 162.72/x
  3. Step 3: Cross multiply
    172.96x = 257.32 × 162.72
  4. Step 4: Simplify right side
    172.96x = 41,871.11
  5. Step 5: Solve for x
    x = 41,871.11/172.96
  6. Step 6: Final answer
    x = 242.09

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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.