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Finding the Third Proportional to 787 and 1,915

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Solution

The third proportional to 787 and 1,915 is: 4,659.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    787 : 1,915 = 1,915 : x
  2. Step 2: Convert to fraction form
    787/1,915 = 1,915/x
  3. Step 3: Cross multiply
    787x = 1,915 × 1,915
  4. Step 4: Simplify right side
    787x = 3,667,225
  5. Step 5: Solve for x
    x = 3,667,225/787
  6. Step 6: Final answer
    x = 4,659.75

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Why These Related Problems?

These problems maintain the same ratio (2.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.