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Finding the Third Proportional to 214.88 and 394.31

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Solution

The third proportional to 214.88 and 394.31 is: 723.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.88 : 394.31 = 394.31 : x
  2. Step 2: Convert to fraction form
    214.88/394.31 = 394.31/x
  3. Step 3: Cross multiply
    214.88x = 394.31 × 394.31
  4. Step 4: Simplify right side
    214.88x = 155,482.35
  5. Step 5: Solve for x
    x = 155,482.35/214.88
  6. Step 6: Final answer
    x = 723.59

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.