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Finding the Fourth Proportional to 212.14, 318.24 and 75.19

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Solution

The fourth proportional to 212.14, 318.24 and 75.19 is: 112.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.14 : 318.24 = 75.19 : x
  2. Step 2: Convert to fraction form
    212.14/318.24 = 75.19/x
  3. Step 3: Cross multiply
    212.14x = 318.24 × 75.19
  4. Step 4: Simplify right side
    212.14x = 23,926.50
  5. Step 5: Solve for x
    x = 23,926.50/212.14
  6. Step 6: Final answer
    x = 112.79

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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.