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Finding the Fourth Proportional to 397.89, 548.43 and 280.02

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Solution

The fourth proportional to 397.89, 548.43 and 280.02 is: 385.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.89 : 548.43 = 280.02 : x
  2. Step 2: Convert to fraction form
    397.89/548.43 = 280.02/x
  3. Step 3: Cross multiply
    397.89x = 548.43 × 280.02
  4. Step 4: Simplify right side
    397.89x = 153,571.37
  5. Step 5: Solve for x
    x = 153,571.37/397.89
  6. Step 6: Final answer
    x = 385.96

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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.