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Finding the Fourth Proportional to 397.65, 548.90 and 248.21

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Solution

The fourth proportional to 397.65, 548.90 and 248.21 is: 342.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.65 : 548.90 = 248.21 : x
  2. Step 2: Convert to fraction form
    397.65/548.90 = 248.21/x
  3. Step 3: Cross multiply
    397.65x = 548.90 × 248.21
  4. Step 4: Simplify right side
    397.65x = 136,239.72
  5. Step 5: Solve for x
    x = 136,239.72/397.65
  6. Step 6: Final answer
    x = 342.61

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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.