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Finding the Fourth Proportional to 397.39, 548.40 and 220.36

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Solution

The fourth proportional to 397.39, 548.40 and 220.36 is: 304.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.39 : 548.40 = 220.36 : x
  2. Step 2: Convert to fraction form
    397.39/548.40 = 220.36/x
  3. Step 3: Cross multiply
    397.39x = 548.40 × 220.36
  4. Step 4: Simplify right side
    397.39x = 120,845.42
  5. Step 5: Solve for x
    x = 120,845.42/397.39
  6. Step 6: Final answer
    x = 304.10

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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.