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Finding the Fourth Proportional to 172.88, 238.92 and 138.32

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Solution

The fourth proportional to 172.88, 238.92 and 138.32 is: 191.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.88 : 238.92 = 138.32 : x
  2. Step 2: Convert to fraction form
    172.88/238.92 = 138.32/x
  3. Step 3: Cross multiply
    172.88x = 238.92 × 138.32
  4. Step 4: Simplify right side
    172.88x = 33,047.41
  5. Step 5: Solve for x
    x = 33,047.41/172.88
  6. Step 6: Final answer
    x = 191.16

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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.