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Finding the Third Proportional to 645.75 and 847.69

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Solution

The third proportional to 645.75 and 847.69 is: 1,112.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.75 : 847.69 = 847.69 : x
  2. Step 2: Convert to fraction form
    645.75/847.69 = 847.69/x
  3. Step 3: Cross multiply
    645.75x = 847.69 × 847.69
  4. Step 4: Simplify right side
    645.75x = 718,574.10
  5. Step 5: Solve for x
    x = 718,574.10/645.75
  6. Step 6: Final answer
    x = 1,112.77

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.