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Finding the Fourth Proportional to 217.82, 300.45 and 139.16

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Solution

The fourth proportional to 217.82, 300.45 and 139.16 is: 191.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.82 : 300.45 = 139.16 : x
  2. Step 2: Convert to fraction form
    217.82/300.45 = 139.16/x
  3. Step 3: Cross multiply
    217.82x = 300.45 × 139.16
  4. Step 4: Simplify right side
    217.82x = 41,811.89
  5. Step 5: Solve for x
    x = 41,811.89/217.82
  6. Step 6: Final answer
    x = 191.95

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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.