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Finding the Fourth Proportional to 397.10, 547.99 and 222.49

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Solution

The fourth proportional to 397.10, 547.99 and 222.49 is: 307.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.10 : 547.99 = 222.49 : x
  2. Step 2: Convert to fraction form
    397.10/547.99 = 222.49/x
  3. Step 3: Cross multiply
    397.10x = 547.99 × 222.49
  4. Step 4: Simplify right side
    397.10x = 121,918.44
  5. Step 5: Solve for x
    x = 121,918.44/397.10
  6. Step 6: Final answer
    x = 307.02

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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.