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Finding the Fourth Proportional to 217.56, 325.90 and 140.25

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Solution

The fourth proportional to 217.56, 325.90 and 140.25 is: 210.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.56 : 325.90 = 140.25 : x
  2. Step 2: Convert to fraction form
    217.56/325.90 = 140.25/x
  3. Step 3: Cross multiply
    217.56x = 325.90 × 140.25
  4. Step 4: Simplify right side
    217.56x = 45,707.12
  5. Step 5: Solve for x
    x = 45,707.12/217.56
  6. Step 6: Final answer
    x = 210.09

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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.