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Finding the Third Proportional to 831.94 and 1,220.91

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Solution

The third proportional to 831.94 and 1,220.91 is: 1,791.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.94 : 1,220.91 = 1,220.91 : x
  2. Step 2: Convert to fraction form
    831.94/1,220.91 = 1,220.91/x
  3. Step 3: Cross multiply
    831.94x = 1,220.91 × 1,220.91
  4. Step 4: Simplify right side
    831.94x = 1,490,612.07
  5. Step 5: Solve for x
    x = 1,490,612.07/831.94
  6. Step 6: Final answer
    x = 1,791.74

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.