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Finding the Third Proportional to 786.50 and 1,219

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Solution

The third proportional to 786.50 and 1,219 is: 1,889.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.50 : 1,219 = 1,219 : x
  2. Step 2: Convert to fraction form
    786.50/1,219 = 1,219/x
  3. Step 3: Cross multiply
    786.50x = 1,219 × 1,219
  4. Step 4: Simplify right side
    786.50x = 1,485,961
  5. Step 5: Solve for x
    x = 1,485,961/786.50
  6. Step 6: Final answer
    x = 1,889.33

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.