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Finding the Fourth Proportional to 221.65, 305.84 and 123.39

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Solution

The fourth proportional to 221.65, 305.84 and 123.39 is: 170.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.65 : 305.84 = 123.39 : x
  2. Step 2: Convert to fraction form
    221.65/305.84 = 123.39/x
  3. Step 3: Cross multiply
    221.65x = 305.84 × 123.39
  4. Step 4: Simplify right side
    221.65x = 37,737.91
  5. Step 5: Solve for x
    x = 37,737.91/221.65
  6. Step 6: Final answer
    x = 170.26

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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.