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Finding the Fourth Proportional to 821.78, 1,134.87 and 769.52

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Solution

The fourth proportional to 821.78, 1,134.87 and 769.52 is: 1,062.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.78 : 1,134.87 = 769.52 : x
  2. Step 2: Convert to fraction form
    821.78/1,134.87 = 769.52/x
  3. Step 3: Cross multiply
    821.78x = 1,134.87 × 769.52
  4. Step 4: Simplify right side
    821.78x = 873,305.16
  5. Step 5: Solve for x
    x = 873,305.16/821.78
  6. Step 6: Final answer
    x = 1,062.70

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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.