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Finding the Third Proportional to 681.19 and 909.56

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Solution

The third proportional to 681.19 and 909.56 is: 1,214.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.19 : 909.56 = 909.56 : x
  2. Step 2: Convert to fraction form
    681.19/909.56 = 909.56/x
  3. Step 3: Cross multiply
    681.19x = 909.56 × 909.56
  4. Step 4: Simplify right side
    681.19x = 827,303.94
  5. Step 5: Solve for x
    x = 827,303.94/681.19
  6. Step 6: Final answer
    x = 1,214.50

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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.