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Finding the Third Proportional to 780 and 1,170

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Solution

The third proportional to 780 and 1,170 is: 1,755

Step by Step Solution

  1. Step 1: Write the proportion equation
    780 : 1,170 = 1,170 : x
  2. Step 2: Convert to fraction form
    780/1,170 = 1,170/x
  3. Step 3: Cross multiply
    780x = 1,170 × 1,170
  4. Step 4: Simplify right side
    780x = 1,368,900
  5. Step 5: Solve for x
    x = 1,368,900/780
  6. Step 6: Final answer
    x = 1,755

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.