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Finding the Fourth Proportional to 288.81, 398.30 and 217.62

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Solution

The fourth proportional to 288.81, 398.30 and 217.62 is: 300.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.81 : 398.30 = 217.62 : x
  2. Step 2: Convert to fraction form
    288.81/398.30 = 217.62/x
  3. Step 3: Cross multiply
    288.81x = 398.30 × 217.62
  4. Step 4: Simplify right side
    288.81x = 86,676.96
  5. Step 5: Solve for x
    x = 86,676.96/288.81
  6. Step 6: Final answer
    x = 300.12

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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.