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Finding the Fourth Proportional to 397.19, 548.42 and 257.39

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Solution

The fourth proportional to 397.19, 548.42 and 257.39 is: 355.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.19 : 548.42 = 257.39 : x
  2. Step 2: Convert to fraction form
    397.19/548.42 = 257.39/x
  3. Step 3: Cross multiply
    397.19x = 548.42 × 257.39
  4. Step 4: Simplify right side
    397.19x = 141,157.91
  5. Step 5: Solve for x
    x = 141,157.91/397.19
  6. Step 6: Final answer
    x = 355.39

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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.