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Finding the Fourth Proportional to 222.21, 306.76 and 172.31

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Solution

The fourth proportional to 222.21, 306.76 and 172.31 is: 237.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.21 : 306.76 = 172.31 : x
  2. Step 2: Convert to fraction form
    222.21/306.76 = 172.31/x
  3. Step 3: Cross multiply
    222.21x = 306.76 × 172.31
  4. Step 4: Simplify right side
    222.21x = 52,856.28
  5. Step 5: Solve for x
    x = 52,856.28/222.21
  6. Step 6: Final answer
    x = 237.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.