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Finding the Fourth Proportional to 221.80, 306.08 and 123.54

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Solution

The fourth proportional to 221.80, 306.08 and 123.54 is: 170.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.80 : 306.08 = 123.54 : x
  2. Step 2: Convert to fraction form
    221.80/306.08 = 123.54/x
  3. Step 3: Cross multiply
    221.80x = 306.08 × 123.54
  4. Step 4: Simplify right side
    221.80x = 37,813.12
  5. Step 5: Solve for x
    x = 37,813.12/221.80
  6. Step 6: Final answer
    x = 170.48

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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.