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Finding the Third Proportional to 664.31 and 1,128.09

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Solution

The third proportional to 664.31 and 1,128.09 is: 1,915.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.31 : 1,128.09 = 1,128.09 : x
  2. Step 2: Convert to fraction form
    664.31/1,128.09 = 1,128.09/x
  3. Step 3: Cross multiply
    664.31x = 1,128.09 × 1,128.09
  4. Step 4: Simplify right side
    664.31x = 1,272,595.51
  5. Step 5: Solve for x
    x = 1,272,595.51/664.31
  6. Step 6: Final answer
    x = 1,915.66

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.