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Finding the Fourth Proportional to 172.12, 238.74 and 155.92

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Solution

The fourth proportional to 172.12, 238.74 and 155.92 is: 216.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.12 : 238.74 = 155.92 : x
  2. Step 2: Convert to fraction form
    172.12/238.74 = 155.92/x
  3. Step 3: Cross multiply
    172.12x = 238.74 × 155.92
  4. Step 4: Simplify right side
    172.12x = 37,224.34
  5. Step 5: Solve for x
    x = 37,224.34/172.12
  6. Step 6: Final answer
    x = 216.27

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.