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Finding the Fourth Proportional to 223.12, 307.91 and 122.18

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Solution

The fourth proportional to 223.12, 307.91 and 122.18 is: 168.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.12 : 307.91 = 122.18 : x
  2. Step 2: Convert to fraction form
    223.12/307.91 = 122.18/x
  3. Step 3: Cross multiply
    223.12x = 307.91 × 122.18
  4. Step 4: Simplify right side
    223.12x = 37,621.46
  5. Step 5: Solve for x
    x = 37,621.46/223.12
  6. Step 6: Final answer
    x = 168.61

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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.