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Finding the Third Proportional to 187.31 and 392.34

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Solution

The third proportional to 187.31 and 392.34 is: 821.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.31 : 392.34 = 392.34 : x
  2. Step 2: Convert to fraction form
    187.31/392.34 = 392.34/x
  3. Step 3: Cross multiply
    187.31x = 392.34 × 392.34
  4. Step 4: Simplify right side
    187.31x = 153,933.62
  5. Step 5: Solve for x
    x = 153,933.62/187.31
  6. Step 6: Final answer
    x = 821.80

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.