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Finding the Fourth Proportional to 397.51, 548.55 and 220.47

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Solution

The fourth proportional to 397.51, 548.55 and 220.47 is: 304.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.51 : 548.55 = 220.47 : x
  2. Step 2: Convert to fraction form
    397.51/548.55 = 220.47/x
  3. Step 3: Cross multiply
    397.51x = 548.55 × 220.47
  4. Step 4: Simplify right side
    397.51x = 120,936.08
  5. Step 5: Solve for x
    x = 120,936.08/397.51
  6. Step 6: Final answer
    x = 304.23

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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.