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Finding the Third Proportional to 289.88 and 634.75

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Solution

The third proportional to 289.88 and 634.75 is: 1,389.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.88 : 634.75 = 634.75 : x
  2. Step 2: Convert to fraction form
    289.88/634.75 = 634.75/x
  3. Step 3: Cross multiply
    289.88x = 634.75 × 634.75
  4. Step 4: Simplify right side
    289.88x = 402,907.56
  5. Step 5: Solve for x
    x = 402,907.56/289.88
  6. Step 6: Final answer
    x = 1,389.94

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.