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Finding the Fourth Proportional to 219.05, 302.28 and 120.81

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Solution

The fourth proportional to 219.05, 302.28 and 120.81 is: 166.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.05 : 302.28 = 120.81 : x
  2. Step 2: Convert to fraction form
    219.05/302.28 = 120.81/x
  3. Step 3: Cross multiply
    219.05x = 302.28 × 120.81
  4. Step 4: Simplify right side
    219.05x = 36,516.33
  5. Step 5: Solve for x
    x = 36,516.33/219.05
  6. Step 6: Final answer
    x = 166.70

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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.