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Finding the Fourth Proportional to 222.72, 331.80 and 218.40

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Solution

The fourth proportional to 222.72, 331.80 and 218.40 is: 325.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.72 : 331.80 = 218.40 : x
  2. Step 2: Convert to fraction form
    222.72/331.80 = 218.40/x
  3. Step 3: Cross multiply
    222.72x = 331.80 × 218.40
  4. Step 4: Simplify right side
    222.72x = 72,465.12
  5. Step 5: Solve for x
    x = 72,465.12/222.72
  6. Step 6: Final answer
    x = 325.36

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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.