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Finding the Fourth Proportional to 239.15, 330.26 and 217.28

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Solution

The fourth proportional to 239.15, 330.26 and 217.28 is: 300.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.15 : 330.26 = 217.28 : x
  2. Step 2: Convert to fraction form
    239.15/330.26 = 217.28/x
  3. Step 3: Cross multiply
    239.15x = 330.26 × 217.28
  4. Step 4: Simplify right side
    239.15x = 71,756.16
  5. Step 5: Solve for x
    x = 71,756.16/239.15
  6. Step 6: Final answer
    x = 300.05

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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.