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Finding the Fourth Proportional to 212.11, 318.15 and 65.86

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Solution

The fourth proportional to 212.11, 318.15 and 65.86 is: 98.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.11 : 318.15 = 65.86 : x
  2. Step 2: Convert to fraction form
    212.11/318.15 = 65.86/x
  3. Step 3: Cross multiply
    212.11x = 318.15 × 65.86
  4. Step 4: Simplify right side
    212.11x = 20,953.36
  5. Step 5: Solve for x
    x = 20,953.36/212.11
  6. Step 6: Final answer
    x = 98.79

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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.