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Finding the Fourth Proportional to 548.43, 756.72 and 399.29

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Solution

The fourth proportional to 548.43, 756.72 and 399.29 is: 550.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.43 : 756.72 = 399.29 : x
  2. Step 2: Convert to fraction form
    548.43/756.72 = 399.29/x
  3. Step 3: Cross multiply
    548.43x = 756.72 × 399.29
  4. Step 4: Simplify right side
    548.43x = 302,148.73
  5. Step 5: Solve for x
    x = 302,148.73/548.43
  6. Step 6: Final answer
    x = 550.93

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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.