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Finding the Fourth Proportional to 221.35, 305.48 and 123.13

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Solution

The fourth proportional to 221.35, 305.48 and 123.13 is: 169.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.35 : 305.48 = 123.13 : x
  2. Step 2: Convert to fraction form
    221.35/305.48 = 123.13/x
  3. Step 3: Cross multiply
    221.35x = 305.48 × 123.13
  4. Step 4: Simplify right side
    221.35x = 37,613.75
  5. Step 5: Solve for x
    x = 37,613.75/221.35
  6. Step 6: Final answer
    x = 169.93

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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.