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Finding the Fourth Proportional to 397.21, 548.13 and 222.52

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Solution

The fourth proportional to 397.21, 548.13 and 222.52 is: 307.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.21 : 548.13 = 222.52 : x
  2. Step 2: Convert to fraction form
    397.21/548.13 = 222.52/x
  3. Step 3: Cross multiply
    397.21x = 548.13 × 222.52
  4. Step 4: Simplify right side
    397.21x = 121,969.89
  5. Step 5: Solve for x
    x = 121,969.89/397.21
  6. Step 6: Final answer
    x = 307.07

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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.