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Finding the Fourth Proportional to 397.70, 548.97 and 266.78

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Solution

The fourth proportional to 397.70, 548.97 and 266.78 is: 368.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.70 : 548.97 = 266.78 : x
  2. Step 2: Convert to fraction form
    397.70/548.97 = 266.78/x
  3. Step 3: Cross multiply
    397.70x = 548.97 × 266.78
  4. Step 4: Simplify right side
    397.70x = 146,451.47
  5. Step 5: Solve for x
    x = 146,451.47/397.70
  6. Step 6: Final answer
    x = 368.25

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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.