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Finding the Fourth Proportional to 288.43, 433.45 and 217.15

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Solution

The fourth proportional to 288.43, 433.45 and 217.15 is: 326.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.43 : 433.45 = 217.15 : x
  2. Step 2: Convert to fraction form
    288.43/433.45 = 217.15/x
  3. Step 3: Cross multiply
    288.43x = 433.45 × 217.15
  4. Step 4: Simplify right side
    288.43x = 94,122.86
  5. Step 5: Solve for x
    x = 94,122.86/288.43
  6. Step 6: Final answer
    x = 326.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.