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Finding the Fourth Proportional to 217.95, 300.79 and 135.11

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Solution

The fourth proportional to 217.95, 300.79 and 135.11 is: 186.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.95 : 300.79 = 135.11 : x
  2. Step 2: Convert to fraction form
    217.95/300.79 = 135.11/x
  3. Step 3: Cross multiply
    217.95x = 300.79 × 135.11
  4. Step 4: Simplify right side
    217.95x = 40,637.56
  5. Step 5: Solve for x
    x = 40,637.56/217.95
  6. Step 6: Final answer
    x = 186.45

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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.