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Finding the Fourth Proportional to 217.87, 300.75 and 135.07

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Solution

The fourth proportional to 217.87, 300.75 and 135.07 is: 186.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.87 : 300.75 = 135.07 : x
  2. Step 2: Convert to fraction form
    217.87/300.75 = 135.07/x
  3. Step 3: Cross multiply
    217.87x = 300.75 × 135.07
  4. Step 4: Simplify right side
    217.87x = 40,622.30
  5. Step 5: Solve for x
    x = 40,622.30/217.87
  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.