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Finding the Fourth Proportional to 547.92, 756 and 398.88

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Solution

The fourth proportional to 547.92, 756 and 398.88 is: 550.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.92 : 756 = 398.88 : x
  2. Step 2: Convert to fraction form
    547.92/756 = 398.88/x
  3. Step 3: Cross multiply
    547.92x = 756 × 398.88
  4. Step 4: Simplify right side
    547.92x = 301,553.28
  5. Step 5: Solve for x
    x = 301,553.28/547.92
  6. Step 6: Final answer
    x = 550.36

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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.