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Finding the Fourth Proportional to 222.18, 307.91 and 217.86

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Solution

The fourth proportional to 222.18, 307.91 and 217.86 is: 301.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.18 : 307.91 = 217.86 : x
  2. Step 2: Convert to fraction form
    222.18/307.91 = 217.86/x
  3. Step 3: Cross multiply
    222.18x = 307.91 × 217.86
  4. Step 4: Simplify right side
    222.18x = 67,080.18
  5. Step 5: Solve for x
    x = 67,080.18/222.18
  6. Step 6: Final answer
    x = 301.92

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.