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Finding the Third Proportional to 840.75 and 1,285.13

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Solution

The third proportional to 840.75 and 1,285.13 is: 1,964.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.75 : 1,285.13 = 1,285.13 : x
  2. Step 2: Convert to fraction form
    840.75/1,285.13 = 1,285.13/x
  3. Step 3: Cross multiply
    840.75x = 1,285.13 × 1,285.13
  4. Step 4: Simplify right side
    840.75x = 1,651,546.27
  5. Step 5: Solve for x
    x = 1,651,546.27/840.75
  6. Step 6: Final answer
    x = 1,964.37

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.