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Finding the Third Proportional to 909.56 and 1,221.75

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Solution

The third proportional to 909.56 and 1,221.75 is: 1,641.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.56 : 1,221.75 = 1,221.75 : x
  2. Step 2: Convert to fraction form
    909.56/1,221.75 = 1,221.75/x
  3. Step 3: Cross multiply
    909.56x = 1,221.75 × 1,221.75
  4. Step 4: Simplify right side
    909.56x = 1,492,673.06
  5. Step 5: Solve for x
    x = 1,492,673.06/909.56
  6. Step 6: Final answer
    x = 1,641.09

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.