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Finding the Third Proportional to 389.81 and 620.16

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Solution

The third proportional to 389.81 and 620.16 is: 986.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.81 : 620.16 = 620.16 : x
  2. Step 2: Convert to fraction form
    389.81/620.16 = 620.16/x
  3. Step 3: Cross multiply
    389.81x = 620.16 × 620.16
  4. Step 4: Simplify right side
    389.81x = 384,593.77
  5. Step 5: Solve for x
    x = 384,593.77/389.81
  6. Step 6: Final answer
    x = 986.61

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.