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Finding the Third Proportional to 389.81 and 425.25

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Solution

The third proportional to 389.81 and 425.25 is: 463.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.81 : 425.25 = 425.25 : x
  2. Step 2: Convert to fraction form
    389.81/425.25 = 425.25/x
  3. Step 3: Cross multiply
    389.81x = 425.25 × 425.25
  4. Step 4: Simplify right side
    389.81x = 180,837.56
  5. Step 5: Solve for x
    x = 180,837.56/389.81
  6. Step 6: Final answer
    x = 463.91

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.