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Finding the Fourth Proportional to 217.95, 326.65 and 115.28

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Solution

The fourth proportional to 217.95, 326.65 and 115.28 is: 172.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.95 : 326.65 = 115.28 : x
  2. Step 2: Convert to fraction form
    217.95/326.65 = 115.28/x
  3. Step 3: Cross multiply
    217.95x = 326.65 × 115.28
  4. Step 4: Simplify right side
    217.95x = 37,656.21
  5. Step 5: Solve for x
    x = 37,656.21/217.95
  6. Step 6: Final answer
    x = 172.77

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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.