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Finding the Fourth Proportional to 827.78, 1,135.81 and 820.04

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Solution

The fourth proportional to 827.78, 1,135.81 and 820.04 is: 1,125.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.78 : 1,135.81 = 820.04 : x
  2. Step 2: Convert to fraction form
    827.78/1,135.81 = 820.04/x
  3. Step 3: Cross multiply
    827.78x = 1,135.81 × 820.04
  4. Step 4: Simplify right side
    827.78x = 931,409.63
  5. Step 5: Solve for x
    x = 931,409.63/827.78
  6. Step 6: Final answer
    x = 1,125.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.