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Finding the Fourth Proportional to 548.78, 757.31 and 300.09

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Solution

The fourth proportional to 548.78, 757.31 and 300.09 is: 414.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.78 : 757.31 = 300.09 : x
  2. Step 2: Convert to fraction form
    548.78/757.31 = 300.09/x
  3. Step 3: Cross multiply
    548.78x = 757.31 × 300.09
  4. Step 4: Simplify right side
    548.78x = 227,259.66
  5. Step 5: Solve for x
    x = 227,259.66/548.78
  6. Step 6: Final answer
    x = 414.12

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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.