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Finding the Third Proportional to 665 and 1,128

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Solution

The third proportional to 665 and 1,128 is: 1,913.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    665 : 1,128 = 1,128 : x
  2. Step 2: Convert to fraction form
    665/1,128 = 1,128/x
  3. Step 3: Cross multiply
    665x = 1,128 × 1,128
  4. Step 4: Simplify right side
    665x = 1,272,384
  5. Step 5: Solve for x
    x = 1,272,384/665
  6. Step 6: Final answer
    x = 1,913.36

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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.