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Finding the Third Proportional to 840.25 and 1,292.75

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Solution

The third proportional to 840.25 and 1,292.75 is: 1,988.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.25 : 1,292.75 = 1,292.75 : x
  2. Step 2: Convert to fraction form
    840.25/1,292.75 = 1,292.75/x
  3. Step 3: Cross multiply
    840.25x = 1,292.75 × 1,292.75
  4. Step 4: Simplify right side
    840.25x = 1,671,202.56
  5. Step 5: Solve for x
    x = 1,671,202.56/840.25
  6. Step 6: Final answer
    x = 1,988.93

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.