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Finding the Fourth Proportional to 217.78, 300.65 and 148.21

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Solution

The fourth proportional to 217.78, 300.65 and 148.21 is: 204.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.78 : 300.65 = 148.21 : x
  2. Step 2: Convert to fraction form
    217.78/300.65 = 148.21/x
  3. Step 3: Cross multiply
    217.78x = 300.65 × 148.21
  4. Step 4: Simplify right side
    217.78x = 44,559.34
  5. Step 5: Solve for x
    x = 44,559.34/217.78
  6. Step 6: Final answer
    x = 204.61

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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.