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Finding the Third Proportional to 390.60 and 605.60

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Solution

The third proportional to 390.60 and 605.60 is: 938.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.60 : 605.60 = 605.60 : x
  2. Step 2: Convert to fraction form
    390.60/605.60 = 605.60/x
  3. Step 3: Cross multiply
    390.60x = 605.60 × 605.60
  4. Step 4: Simplify right side
    390.60x = 366,753.25
  5. Step 5: Solve for x
    x = 366,753.25/390.60
  6. Step 6: Final answer
    x = 938.94

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.