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Finding the Fourth Proportional to 218.74, 301.86 and 120.49

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Solution

The fourth proportional to 218.74, 301.86 and 120.49 is: 166.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.74 : 301.86 = 120.49 : x
  2. Step 2: Convert to fraction form
    218.74/301.86 = 120.49/x
  3. Step 3: Cross multiply
    218.74x = 301.86 × 120.49
  4. Step 4: Simplify right side
    218.74x = 36,371.11
  5. Step 5: Solve for x
    x = 36,371.11/218.74
  6. Step 6: Final answer
    x = 166.28

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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.