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Finding the Fourth Proportional to 397.18, 548.13 and 222.53

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Solution

The fourth proportional to 397.18, 548.13 and 222.53 is: 307.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.18 : 548.13 = 222.53 : x
  2. Step 2: Convert to fraction form
    397.18/548.13 = 222.53/x
  3. Step 3: Cross multiply
    397.18x = 548.13 × 222.53
  4. Step 4: Simplify right side
    397.18x = 121,971.52
  5. Step 5: Solve for x
    x = 121,971.52/397.18
  6. Step 6: Final answer
    x = 307.09

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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.