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Finding the Fourth Proportional to 217.54, 299.74 and 191.11

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Solution

The fourth proportional to 217.54, 299.74 and 191.11 is: 263.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.54 : 299.74 = 191.11 : x
  2. Step 2: Convert to fraction form
    217.54/299.74 = 191.11/x
  3. Step 3: Cross multiply
    217.54x = 299.74 × 191.11
  4. Step 4: Simplify right side
    217.54x = 57,280.86
  5. Step 5: Solve for x
    x = 57,280.86/217.54
  6. Step 6: Final answer
    x = 263.32

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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.