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Finding the Fourth Proportional to 212.17, 318.29 and 75.21

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Solution

The fourth proportional to 212.17, 318.29 and 75.21 is: 112.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.17 : 318.29 = 75.21 : x
  2. Step 2: Convert to fraction form
    212.17/318.29 = 75.21/x
  3. Step 3: Cross multiply
    212.17x = 318.29 × 75.21
  4. Step 4: Simplify right side
    212.17x = 23,938.59
  5. Step 5: Solve for x
    x = 23,938.59/212.17
  6. Step 6: Final answer
    x = 112.83

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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.