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Finding the Third Proportional to 31,140 and 68,328

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Solution

The third proportional to 31,140 and 68,328 is: 149,926.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,140 : 68,328 = 68,328 : x
  2. Step 2: Convert to fraction form
    31,140/68,328 = 68,328/x
  3. Step 3: Cross multiply
    31,140x = 68,328 × 68,328
  4. Step 4: Simplify right side
    31,140x = 4,668,715,584
  5. Step 5: Solve for x
    x = 4,668,715,584/31,140
  6. Step 6: Final answer
    x = 149,926.64

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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.