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Finding the Fourth Proportional to 300.53, 414.71 and 172.78

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Solution

The fourth proportional to 300.53, 414.71 and 172.78 is: 238.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.53 : 414.71 = 172.78 : x
  2. Step 2: Convert to fraction form
    300.53/414.71 = 172.78/x
  3. Step 3: Cross multiply
    300.53x = 414.71 × 172.78
  4. Step 4: Simplify right side
    300.53x = 71,654.35
  5. Step 5: Solve for x
    x = 71,654.35/300.53
  6. Step 6: Final answer
    x = 238.42

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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.