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Finding the Fourth Proportional to 218.45, 301.46 and 120.21

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Solution

The fourth proportional to 218.45, 301.46 and 120.21 is: 165.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.45 : 301.46 = 120.21 : x
  2. Step 2: Convert to fraction form
    218.45/301.46 = 120.21/x
  3. Step 3: Cross multiply
    218.45x = 301.46 × 120.21
  4. Step 4: Simplify right side
    218.45x = 36,237.91
  5. Step 5: Solve for x
    x = 36,237.91/218.45
  6. Step 6: Final answer
    x = 165.89

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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.