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Finding the Third Proportional to 818.50 and 1,390.75

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Solution

The third proportional to 818.50 and 1,390.75 is: 2,363.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.50 : 1,390.75 = 1,390.75 : x
  2. Step 2: Convert to fraction form
    818.50/1,390.75 = 1,390.75/x
  3. Step 3: Cross multiply
    818.50x = 1,390.75 × 1,390.75
  4. Step 4: Simplify right side
    818.50x = 1,934,185.56
  5. Step 5: Solve for x
    x = 1,934,185.56/818.50
  6. Step 6: Final answer
    x = 2,363.09

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.