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Finding the Fourth Proportional to 212.19, 318.04 and 171.32

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Solution

The fourth proportional to 212.19, 318.04 and 171.32 is: 256.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.19 : 318.04 = 171.32 : x
  2. Step 2: Convert to fraction form
    212.19/318.04 = 171.32/x
  3. Step 3: Cross multiply
    212.19x = 318.04 × 171.32
  4. Step 4: Simplify right side
    212.19x = 54,485.56
  5. Step 5: Solve for x
    x = 54,485.56/212.19
  6. Step 6: Final answer
    x = 256.78

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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.