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Finding the Fourth Proportional to 217.12, 324.72 and 130.22

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Solution

The fourth proportional to 217.12, 324.72 and 130.22 is: 194.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.12 : 324.72 = 130.22 : x
  2. Step 2: Convert to fraction form
    217.12/324.72 = 130.22/x
  3. Step 3: Cross multiply
    217.12x = 324.72 × 130.22
  4. Step 4: Simplify right side
    217.12x = 42,285.04
  5. Step 5: Solve for x
    x = 42,285.04/217.12
  6. Step 6: Final answer
    x = 194.75

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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.