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Finding the Third Proportional to 687 and 890.50

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Solution

The third proportional to 687 and 890.50 is: 1,154.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 890.50 = 890.50 : x
  2. Step 2: Convert to fraction form
    687/890.50 = 890.50/x
  3. Step 3: Cross multiply
    687x = 890.50 × 890.50
  4. Step 4: Simplify right side
    687x = 792,990.25
  5. Step 5: Solve for x
    x = 792,990.25/687
  6. Step 6: Final answer
    x = 1,154.28

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.