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Finding the Fourth Proportional to 397.57, 548.64 and 220.53

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Solution

The fourth proportional to 397.57, 548.64 and 220.53 is: 304.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.57 : 548.64 = 220.53 : x
  2. Step 2: Convert to fraction form
    397.57/548.64 = 220.53/x
  3. Step 3: Cross multiply
    397.57x = 548.64 × 220.53
  4. Step 4: Simplify right side
    397.57x = 120,992.13
  5. Step 5: Solve for x
    x = 120,992.13/397.57
  6. Step 6: Final answer
    x = 304.33

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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.