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Finding the Third Proportional to 986.50 and 1,379.75

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Solution

The third proportional to 986.50 and 1,379.75 is: 1,929.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.50 : 1,379.75 = 1,379.75 : x
  2. Step 2: Convert to fraction form
    986.50/1,379.75 = 1,379.75/x
  3. Step 3: Cross multiply
    986.50x = 1,379.75 × 1,379.75
  4. Step 4: Simplify right side
    986.50x = 1,903,710.06
  5. Step 5: Solve for x
    x = 1,903,710.06/986.50
  6. Step 6: Final answer
    x = 1,929.76

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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.