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Finding the Fourth Proportional to 310.13, 428.15 and 216.96

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Solution

The fourth proportional to 310.13, 428.15 and 216.96 is: 299.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.13 : 428.15 = 216.96 : x
  2. Step 2: Convert to fraction form
    310.13/428.15 = 216.96/x
  3. Step 3: Cross multiply
    310.13x = 428.15 × 216.96
  4. Step 4: Simplify right side
    310.13x = 92,889.55
  5. Step 5: Solve for x
    x = 92,889.55/310.13
  6. Step 6: Final answer
    x = 299.52

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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.