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Finding the Third Proportional to 230.50 and 392.75

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Solution

The third proportional to 230.50 and 392.75 is: 669.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.50 : 392.75 = 392.75 : x
  2. Step 2: Convert to fraction form
    230.50/392.75 = 392.75/x
  3. Step 3: Cross multiply
    230.50x = 392.75 × 392.75
  4. Step 4: Simplify right side
    230.50x = 154,252.56
  5. Step 5: Solve for x
    x = 154,252.56/230.50
  6. Step 6: Final answer
    x = 669.21

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.