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Finding the Fourth Proportional to 892.90, 1,231.05 and 717.94

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Solution

The fourth proportional to 892.90, 1,231.05 and 717.94 is: 989.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.90 : 1,231.05 = 717.94 : x
  2. Step 2: Convert to fraction form
    892.90/1,231.05 = 717.94/x
  3. Step 3: Cross multiply
    892.90x = 1,231.05 × 717.94
  4. Step 4: Simplify right side
    892.90x = 883,820.04
  5. Step 5: Solve for x
    x = 883,820.04/892.90
  6. Step 6: Final answer
    x = 989.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.