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Finding the Third Proportional to 813.38 and 1,687.50

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Solution

The third proportional to 813.38 and 1,687.50 is: 3,501.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.38 : 1,687.50 = 1,687.50 : x
  2. Step 2: Convert to fraction form
    813.38/1,687.50 = 1,687.50/x
  3. Step 3: Cross multiply
    813.38x = 1,687.50 × 1,687.50
  4. Step 4: Simplify right side
    813.38x = 2,847,656.25
  5. Step 5: Solve for x
    x = 2,847,656.25/813.38
  6. Step 6: Final answer
    x = 3,501.04

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.