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Finding the Third Proportional to 289 and 780.50

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Solution

The third proportional to 289 and 780.50 is: 2,107.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    289 : 780.50 = 780.50 : x
  2. Step 2: Convert to fraction form
    289/780.50 = 780.50/x
  3. Step 3: Cross multiply
    289x = 780.50 × 780.50
  4. Step 4: Simplify right side
    289x = 609,180.25
  5. Step 5: Solve for x
    x = 609,180.25/289
  6. Step 6: Final answer
    x = 2,107.89

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Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.