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Finding the Third Proportional to 31,316 and 66,790

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Solution

The third proportional to 31,316 and 66,790 is: 142,448.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,316 : 66,790 = 66,790 : x
  2. Step 2: Convert to fraction form
    31,316/66,790 = 66,790/x
  3. Step 3: Cross multiply
    31,316x = 66,790 × 66,790
  4. Step 4: Simplify right side
    31,316x = 4,460,904,100
  5. Step 5: Solve for x
    x = 4,460,904,100/31,316
  6. Step 6: Final answer
    x = 142,448.08

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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.