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Finding the Third Proportional to 390.50 and 823.75

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Solution

The third proportional to 390.50 and 823.75 is: 1,737.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.50 : 823.75 = 823.75 : x
  2. Step 2: Convert to fraction form
    390.50/823.75 = 823.75/x
  3. Step 3: Cross multiply
    390.50x = 823.75 × 823.75
  4. Step 4: Simplify right side
    390.50x = 678,564.06
  5. Step 5: Solve for x
    x = 678,564.06/390.50
  6. Step 6: Final answer
    x = 1,737.68

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.