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Finding the Third Proportional to 777.50 and 1,578

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Solution

The third proportional to 777.50 and 1,578 is: 3,202.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.50 : 1,578 = 1,578 : x
  2. Step 2: Convert to fraction form
    777.50/1,578 = 1,578/x
  3. Step 3: Cross multiply
    777.50x = 1,578 × 1,578
  4. Step 4: Simplify right side
    777.50x = 2,490,084
  5. Step 5: Solve for x
    x = 2,490,084/777.50
  6. Step 6: Final answer
    x = 3,202.68

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.