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Finding the Fourth Proportional to 827.23, 1,141.20 and 661.67

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Solution

The fourth proportional to 827.23, 1,141.20 and 661.67 is: 912.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.23 : 1,141.20 = 661.67 : x
  2. Step 2: Convert to fraction form
    827.23/1,141.20 = 661.67/x
  3. Step 3: Cross multiply
    827.23x = 1,141.20 × 661.67
  4. Step 4: Simplify right side
    827.23x = 755,100.66
  5. Step 5: Solve for x
    x = 755,100.66/827.23
  6. Step 6: Final answer
    x = 912.81

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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.