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Finding the Third Proportional to 31,090 and 66,330

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Solution

The third proportional to 31,090 and 66,330 is: 141,513.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,090 : 66,330 = 66,330 : x
  2. Step 2: Convert to fraction form
    31,090/66,330 = 66,330/x
  3. Step 3: Cross multiply
    31,090x = 66,330 × 66,330
  4. Step 4: Simplify right side
    31,090x = 4,399,668,900
  5. Step 5: Solve for x
    x = 4,399,668,900/31,090
  6. Step 6: Final answer
    x = 141,513.96

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.