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Finding the Fourth Proportional to 172.72, 260.34 and 158.11

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Solution

The fourth proportional to 172.72, 260.34 and 158.11 is: 238.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.72 : 260.34 = 158.11 : x
  2. Step 2: Convert to fraction form
    172.72/260.34 = 158.11/x
  3. Step 3: Cross multiply
    172.72x = 260.34 × 158.11
  4. Step 4: Simplify right side
    172.72x = 41,162.36
  5. Step 5: Solve for x
    x = 41,162.36/172.72
  6. Step 6: Final answer
    x = 238.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.