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Finding the Fourth Proportional to 310.53, 428.60 and 211.14

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Solution

The fourth proportional to 310.53, 428.60 and 211.14 is: 291.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.53 : 428.60 = 211.14 : x
  2. Step 2: Convert to fraction form
    310.53/428.60 = 211.14/x
  3. Step 3: Cross multiply
    310.53x = 428.60 × 211.14
  4. Step 4: Simplify right side
    310.53x = 90,493.55
  5. Step 5: Solve for x
    x = 90,493.55/310.53
  6. Step 6: Final answer
    x = 291.42

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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.