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Finding the Third Proportional to 31,128 and 68,303

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Solution

The third proportional to 31,128 and 68,303 is: 149,874.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,128 : 68,303 = 68,303 : x
  2. Step 2: Convert to fraction form
    31,128/68,303 = 68,303/x
  3. Step 3: Cross multiply
    31,128x = 68,303 × 68,303
  4. Step 4: Simplify right side
    31,128x = 4,665,299,809
  5. Step 5: Solve for x
    x = 4,665,299,809/31,128
  6. Step 6: Final answer
    x = 149,874.70

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.