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Finding the Third Proportional to 645.75 and 1,520.63

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Solution

The third proportional to 645.75 and 1,520.63 is: 3,580.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.75 : 1,520.63 = 1,520.63 : x
  2. Step 2: Convert to fraction form
    645.75/1,520.63 = 1,520.63/x
  3. Step 3: Cross multiply
    645.75x = 1,520.63 × 1,520.63
  4. Step 4: Simplify right side
    645.75x = 2,312,300.39
  5. Step 5: Solve for x
    x = 2,312,300.39/645.75
  6. Step 6: Final answer
    x = 3,580.80

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.