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Finding the Fourth Proportional to 212.21, 318.42 and 75.29

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Solution

The fourth proportional to 212.21, 318.42 and 75.29 is: 112.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.21 : 318.42 = 75.29 : x
  2. Step 2: Convert to fraction form
    212.21/318.42 = 75.29/x
  3. Step 3: Cross multiply
    212.21x = 318.42 × 75.29
  4. Step 4: Simplify right side
    212.21x = 23,972.25
  5. Step 5: Solve for x
    x = 23,972.25/212.21
  6. Step 6: Final answer
    x = 112.97

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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.