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Finding the Fourth Proportional to 218.05, 300.91 and 119.81

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Solution

The fourth proportional to 218.05, 300.91 and 119.81 is: 165.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.05 : 300.91 = 119.81 : x
  2. Step 2: Convert to fraction form
    218.05/300.91 = 119.81/x
  3. Step 3: Cross multiply
    218.05x = 300.91 × 119.81
  4. Step 4: Simplify right side
    218.05x = 36,050.52
  5. Step 5: Solve for x
    x = 36,050.52/218.05
  6. Step 6: Final answer
    x = 165.34

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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.