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Finding the Fourth Proportional to 397.20, 548.01 and 257.34

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Solution

The fourth proportional to 397.20, 548.01 and 257.34 is: 355.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.20 : 548.01 = 257.34 : x
  2. Step 2: Convert to fraction form
    397.20/548.01 = 257.34/x
  3. Step 3: Cross multiply
    397.20x = 548.01 × 257.34
  4. Step 4: Simplify right side
    397.20x = 141,024.89
  5. Step 5: Solve for x
    x = 141,024.89/397.20
  6. Step 6: Final answer
    x = 355.05

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.