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Finding the Fourth Proportional to 211.82, 318.03 and 120.69

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Solution

The fourth proportional to 211.82, 318.03 and 120.69 is: 181.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.82 : 318.03 = 120.69 : x
  2. Step 2: Convert to fraction form
    211.82/318.03 = 120.69/x
  3. Step 3: Cross multiply
    211.82x = 318.03 × 120.69
  4. Step 4: Simplify right side
    211.82x = 38,382.59
  5. Step 5: Solve for x
    x = 38,382.59/211.82
  6. Step 6: Final answer
    x = 181.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.