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Finding the Third Proportional to 777.50 and 1,089

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Solution

The third proportional to 777.50 and 1,089 is: 1,525.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.50 : 1,089 = 1,089 : x
  2. Step 2: Convert to fraction form
    777.50/1,089 = 1,089/x
  3. Step 3: Cross multiply
    777.50x = 1,089 × 1,089
  4. Step 4: Simplify right side
    777.50x = 1,185,921
  5. Step 5: Solve for x
    x = 1,185,921/777.50
  6. Step 6: Final answer
    x = 1,525.30

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.