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Finding the Fourth Proportional to 288.96, 398.36 and 222.68

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Solution

The fourth proportional to 288.96, 398.36 and 222.68 is: 306.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.96 : 398.36 = 222.68 : x
  2. Step 2: Convert to fraction form
    288.96/398.36 = 222.68/x
  3. Step 3: Cross multiply
    288.96x = 398.36 × 222.68
  4. Step 4: Simplify right side
    288.96x = 88,706.80
  5. Step 5: Solve for x
    x = 88,706.80/288.96
  6. Step 6: Final answer
    x = 306.99

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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.