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Finding the Fourth Proportional to 397.70, 548.78 and 220.65

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Solution

The fourth proportional to 397.70, 548.78 and 220.65 is: 304.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.70 : 548.78 = 220.65 : x
  2. Step 2: Convert to fraction form
    397.70/548.78 = 220.65/x
  3. Step 3: Cross multiply
    397.70x = 548.78 × 220.65
  4. Step 4: Simplify right side
    397.70x = 121,087.20
  5. Step 5: Solve for x
    x = 121,087.20/397.70
  6. Step 6: Final answer
    x = 304.47

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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.