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Finding the Third Proportional to 645.47 and 1,389.66

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Solution

The third proportional to 645.47 and 1,389.66 is: 2,991.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.47 : 1,389.66 = 1,389.66 : x
  2. Step 2: Convert to fraction form
    645.47/1,389.66 = 1,389.66/x
  3. Step 3: Cross multiply
    645.47x = 1,389.66 × 1,389.66
  4. Step 4: Simplify right side
    645.47x = 1,931,144.49
  5. Step 5: Solve for x
    x = 1,931,144.49/645.47
  6. Step 6: Final answer
    x = 2,991.85

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.