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Finding the Third Proportional to 782.50 and 1,379

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Solution

The third proportional to 782.50 and 1,379 is: 2,430.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.50 : 1,379 = 1,379 : x
  2. Step 2: Convert to fraction form
    782.50/1,379 = 1,379/x
  3. Step 3: Cross multiply
    782.50x = 1,379 × 1,379
  4. Step 4: Simplify right side
    782.50x = 1,901,641
  5. Step 5: Solve for x
    x = 1,901,641/782.50
  6. Step 6: Final answer
    x = 2,430.21

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.