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Finding the Third Proportional to 387.94 and 423.56

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Solution

The third proportional to 387.94 and 423.56 is: 462.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.94 : 423.56 = 423.56 : x
  2. Step 2: Convert to fraction form
    387.94/423.56 = 423.56/x
  3. Step 3: Cross multiply
    387.94x = 423.56 × 423.56
  4. Step 4: Simplify right side
    387.94x = 179,405.19
  5. Step 5: Solve for x
    x = 179,405.19/387.94
  6. Step 6: Final answer
    x = 462.46

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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.