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Finding the Fourth Proportional to 221.82, 306.08 and 123.56

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Solution

The fourth proportional to 221.82, 306.08 and 123.56 is: 170.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.82 : 306.08 = 123.56 : x
  2. Step 2: Convert to fraction form
    221.82/306.08 = 123.56/x
  3. Step 3: Cross multiply
    221.82x = 306.08 × 123.56
  4. Step 4: Simplify right side
    221.82x = 37,817.10
  5. Step 5: Solve for x
    x = 37,817.10/221.82
  6. Step 6: Final answer
    x = 170.49

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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.