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Finding the Third Proportional to 289.88 and 515.75

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Solution

The third proportional to 289.88 and 515.75 is: 917.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.88 : 515.75 = 515.75 : x
  2. Step 2: Convert to fraction form
    289.88/515.75 = 515.75/x
  3. Step 3: Cross multiply
    289.88x = 515.75 × 515.75
  4. Step 4: Simplify right side
    289.88x = 265,998.06
  5. Step 5: Solve for x
    x = 265,998.06/289.88
  6. Step 6: Final answer
    x = 917.63

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.