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Finding the Fourth Proportional to 221.68, 331.80 and 157.36

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Solution

The fourth proportional to 221.68, 331.80 and 157.36 is: 235.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.68 : 331.80 = 157.36 : x
  2. Step 2: Convert to fraction form
    221.68/331.80 = 157.36/x
  3. Step 3: Cross multiply
    221.68x = 331.80 × 157.36
  4. Step 4: Simplify right side
    221.68x = 52,212.05
  5. Step 5: Solve for x
    x = 52,212.05/221.68
  6. Step 6: Final answer
    x = 235.53

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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.