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Finding the Fourth Proportional to 217.69, 299.80 and 191.36

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Solution

The fourth proportional to 217.69, 299.80 and 191.36 is: 263.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.69 : 299.80 = 191.36 : x
  2. Step 2: Convert to fraction form
    217.69/299.80 = 191.36/x
  3. Step 3: Cross multiply
    217.69x = 299.80 × 191.36
  4. Step 4: Simplify right side
    217.69x = 57,370.72
  5. Step 5: Solve for x
    x = 57,370.72/217.69
  6. Step 6: Final answer
    x = 263.55

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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.