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Finding the Fourth Proportional to 217.08, 325.58 and 80.15

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Solution

The fourth proportional to 217.08, 325.58 and 80.15 is: 120.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.08 : 325.58 = 80.15 : x
  2. Step 2: Convert to fraction form
    217.08/325.58 = 80.15/x
  3. Step 3: Cross multiply
    217.08x = 325.58 × 80.15
  4. Step 4: Simplify right side
    217.08x = 26,093.21
  5. Step 5: Solve for x
    x = 26,093.21/217.08
  6. Step 6: Final answer
    x = 120.20

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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.