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Finding the Fourth Proportional to 827.55, 1,139.76 and 812.34

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Solution

The fourth proportional to 827.55, 1,139.76 and 812.34 is: 1,118.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.55 : 1,139.76 = 812.34 : x
  2. Step 2: Convert to fraction form
    827.55/1,139.76 = 812.34/x
  3. Step 3: Cross multiply
    827.55x = 1,139.76 × 812.34
  4. Step 4: Simplify right side
    827.55x = 925,872.64
  5. Step 5: Solve for x
    x = 925,872.64/827.55
  6. Step 6: Final answer
    x = 1,118.81

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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.