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Finding the Fourth Proportional to 397.77, 548.41 and 257.64

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Solution

The fourth proportional to 397.77, 548.41 and 257.64 is: 355.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.77 : 548.41 = 257.64 : x
  2. Step 2: Convert to fraction form
    397.77/548.41 = 257.64/x
  3. Step 3: Cross multiply
    397.77x = 548.41 × 257.64
  4. Step 4: Simplify right side
    397.77x = 141,292.35
  5. Step 5: Solve for x
    x = 141,292.35/397.77
  6. Step 6: Final answer
    x = 355.21

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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.