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Finding the Third Proportional to 379.13 and 390.56

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Solution

The third proportional to 379.13 and 390.56 is: 402.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.13 : 390.56 = 390.56 : x
  2. Step 2: Convert to fraction form
    379.13/390.56 = 390.56/x
  3. Step 3: Cross multiply
    379.13x = 390.56 × 390.56
  4. Step 4: Simplify right side
    379.13x = 152,539.07
  5. Step 5: Solve for x
    x = 152,539.07/379.13
  6. Step 6: Final answer
    x = 402.35

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Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.