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Finding the Fourth Proportional to 218.12, 325.19 and 212.51

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Solution

The fourth proportional to 218.12, 325.19 and 212.51 is: 316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.12 : 325.19 = 212.51 : x
  2. Step 2: Convert to fraction form
    218.12/325.19 = 212.51/x
  3. Step 3: Cross multiply
    218.12x = 325.19 × 212.51
  4. Step 4: Simplify right side
    218.12x = 69,103.44
  5. Step 5: Solve for x
    x = 69,103.44/218.12
  6. Step 6: Final answer
    x = 316.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.