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Finding the Fourth Proportional to 216.68, 325.38 and 212.72

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Solution

The fourth proportional to 216.68, 325.38 and 212.72 is: 319.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.68 : 325.38 = 212.72 : x
  2. Step 2: Convert to fraction form
    216.68/325.38 = 212.72/x
  3. Step 3: Cross multiply
    216.68x = 325.38 × 212.72
  4. Step 4: Simplify right side
    216.68x = 69,214.83
  5. Step 5: Solve for x
    x = 69,214.83/216.68
  6. Step 6: Final answer
    x = 319.43

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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.