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Finding the Third Proportional to 215.13 and 310.88

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Solution

The third proportional to 215.13 and 310.88 is: 449.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.13 : 310.88 = 310.88 : x
  2. Step 2: Convert to fraction form
    215.13/310.88 = 310.88/x
  3. Step 3: Cross multiply
    215.13x = 310.88 × 310.88
  4. Step 4: Simplify right side
    215.13x = 96,643.27
  5. Step 5: Solve for x
    x = 96,643.27/215.13
  6. Step 6: Final answer
    x = 449.24

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.