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Finding the Third Proportional to 690.50 and 1,450

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Solution

The third proportional to 690.50 and 1,450 is: 3,044.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.50 : 1,450 = 1,450 : x
  2. Step 2: Convert to fraction form
    690.50/1,450 = 1,450/x
  3. Step 3: Cross multiply
    690.50x = 1,450 × 1,450
  4. Step 4: Simplify right side
    690.50x = 2,102,500
  5. Step 5: Solve for x
    x = 2,102,500/690.50
  6. Step 6: Final answer
    x = 3,044.90

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.