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Finding the Fourth Proportional to 222.12, 331.15 and 216.51

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Solution

The fourth proportional to 222.12, 331.15 and 216.51 is: 322.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.12 : 331.15 = 216.51 : x
  2. Step 2: Convert to fraction form
    222.12/331.15 = 216.51/x
  3. Step 3: Cross multiply
    222.12x = 331.15 × 216.51
  4. Step 4: Simplify right side
    222.12x = 71,697.29
  5. Step 5: Solve for x
    x = 71,697.29/222.12
  6. Step 6: Final answer
    x = 322.79

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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.