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Finding the Third Proportional to 770 and 1,550

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Solution

The third proportional to 770 and 1,550 is: 3,120.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    770 : 1,550 = 1,550 : x
  2. Step 2: Convert to fraction form
    770/1,550 = 1,550/x
  3. Step 3: Cross multiply
    770x = 1,550 × 1,550
  4. Step 4: Simplify right side
    770x = 2,402,500
  5. Step 5: Solve for x
    x = 2,402,500/770
  6. Step 6: Final answer
    x = 3,120.13

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Why These Related Problems?

These problems maintain the same ratio (2.01) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.