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Finding the Fourth Proportional to 221.37, 305.51 and 123.15

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Solution

The fourth proportional to 221.37, 305.51 and 123.15 is: 169.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.37 : 305.51 = 123.15 : x
  2. Step 2: Convert to fraction form
    221.37/305.51 = 123.15/x
  3. Step 3: Cross multiply
    221.37x = 305.51 × 123.15
  4. Step 4: Simplify right side
    221.37x = 37,623.56
  5. Step 5: Solve for x
    x = 37,623.56/221.37
  6. Step 6: Final answer
    x = 169.96

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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.