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Finding the Third Proportional to 390.66 and 850.50

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Solution

The third proportional to 390.66 and 850.50 is: 1,851.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.66 : 850.50 = 850.50 : x
  2. Step 2: Convert to fraction form
    390.66/850.50 = 850.50/x
  3. Step 3: Cross multiply
    390.66x = 850.50 × 850.50
  4. Step 4: Simplify right side
    390.66x = 723,350.25
  5. Step 5: Solve for x
    x = 723,350.25/390.66
  6. Step 6: Final answer
    x = 1,851.63

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.