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Finding the Fourth Proportional to 310.70, 428.58 and 223.43

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Solution

The fourth proportional to 310.70, 428.58 and 223.43 is: 308.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.70 : 428.58 = 223.43 : x
  2. Step 2: Convert to fraction form
    310.70/428.58 = 223.43/x
  3. Step 3: Cross multiply
    310.70x = 428.58 × 223.43
  4. Step 4: Simplify right side
    310.70x = 95,755.49
  5. Step 5: Solve for x
    x = 95,755.49/310.70
  6. Step 6: Final answer
    x = 308.19

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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.