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Finding the Third Proportional to 912 and 1,305

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Solution

The third proportional to 912 and 1,305 is: 1,867.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    912 : 1,305 = 1,305 : x
  2. Step 2: Convert to fraction form
    912/1,305 = 1,305/x
  3. Step 3: Cross multiply
    912x = 1,305 × 1,305
  4. Step 4: Simplify right side
    912x = 1,703,025
  5. Step 5: Solve for x
    x = 1,703,025/912
  6. Step 6: Final answer
    x = 1,867.35

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.