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Finding the Fourth Proportional to 288.52, 398.19 and 222.20

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Solution

The fourth proportional to 288.52, 398.19 and 222.20 is: 306.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.52 : 398.19 = 222.20 : x
  2. Step 2: Convert to fraction form
    288.52/398.19 = 222.20/x
  3. Step 3: Cross multiply
    288.52x = 398.19 × 222.20
  4. Step 4: Simplify right side
    288.52x = 88,477.82
  5. Step 5: Solve for x
    x = 88,477.82/288.52
  6. Step 6: Final answer
    x = 306.67

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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.