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Finding the Fourth Proportional to 548.30, 756.70 and 398.97

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Solution

The fourth proportional to 548.30, 756.70 and 398.97 is: 550.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.30 : 756.70 = 398.97 : x
  2. Step 2: Convert to fraction form
    548.30/756.70 = 398.97/x
  3. Step 3: Cross multiply
    548.30x = 756.70 × 398.97
  4. Step 4: Simplify right side
    548.30x = 301,897.98
  5. Step 5: Solve for x
    x = 301,897.98/548.30
  6. Step 6: Final answer
    x = 550.61

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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.