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Finding the Third Proportional to 210.75 and 308.88

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Solution

The third proportional to 210.75 and 308.88 is: 452.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.75 : 308.88 = 308.88 : x
  2. Step 2: Convert to fraction form
    210.75/308.88 = 308.88/x
  3. Step 3: Cross multiply
    210.75x = 308.88 × 308.88
  4. Step 4: Simplify right side
    210.75x = 95,403.77
  5. Step 5: Solve for x
    x = 95,403.77/210.75
  6. Step 6: Final answer
    x = 452.69

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.