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Finding the Fourth Proportional to 157.92, 236.91 and 80.91

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Solution

The fourth proportional to 157.92, 236.91 and 80.91 is: 121.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.92 : 236.91 = 80.91 : x
  2. Step 2: Convert to fraction form
    157.92/236.91 = 80.91/x
  3. Step 3: Cross multiply
    157.92x = 236.91 × 80.91
  4. Step 4: Simplify right side
    157.92x = 19,168.39
  5. Step 5: Solve for x
    x = 19,168.39/157.92
  6. Step 6: Final answer
    x = 121.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.