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Finding the Fourth Proportional to 212.54, 318.42 and 120.96

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Solution

The fourth proportional to 212.54, 318.42 and 120.96 is: 181.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.54 : 318.42 = 120.96 : x
  2. Step 2: Convert to fraction form
    212.54/318.42 = 120.96/x
  3. Step 3: Cross multiply
    212.54x = 318.42 × 120.96
  4. Step 4: Simplify right side
    212.54x = 38,516.08
  5. Step 5: Solve for x
    x = 38,516.08/212.54
  6. Step 6: Final answer
    x = 181.22

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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.