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Finding the Fourth Proportional to 212.39, 318.91 and 201.95

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Solution

The fourth proportional to 212.39, 318.91 and 201.95 is: 303.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.39 : 318.91 = 201.95 : x
  2. Step 2: Convert to fraction form
    212.39/318.91 = 201.95/x
  3. Step 3: Cross multiply
    212.39x = 318.91 × 201.95
  4. Step 4: Simplify right side
    212.39x = 64,402.62
  5. Step 5: Solve for x
    x = 64,402.62/212.39
  6. Step 6: Final answer
    x = 303.23

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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.