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Finding the Third Proportional to 770 and 1,085

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Solution

The third proportional to 770 and 1,085 is: 1,528.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    770 : 1,085 = 1,085 : x
  2. Step 2: Convert to fraction form
    770/1,085 = 1,085/x
  3. Step 3: Cross multiply
    770x = 1,085 × 1,085
  4. Step 4: Simplify right side
    770x = 1,177,225
  5. Step 5: Solve for x
    x = 1,177,225/770
  6. Step 6: Final answer
    x = 1,528.86

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.