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Finding the Fourth Proportional to 397.96, 548.74 and 250.40

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Solution

The fourth proportional to 397.96, 548.74 and 250.40 is: 345.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.96 : 548.74 = 250.40 : x
  2. Step 2: Convert to fraction form
    397.96/548.74 = 250.40/x
  3. Step 3: Cross multiply
    397.96x = 548.74 × 250.40
  4. Step 4: Simplify right side
    397.96x = 137,406.18
  5. Step 5: Solve for x
    x = 137,406.18/397.96
  6. Step 6: Final answer
    x = 345.28

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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.