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Finding the Fourth Proportional to 828.60, 1,143.34 and 769.74

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Solution

The fourth proportional to 828.60, 1,143.34 and 769.74 is: 1,062.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.60 : 1,143.34 = 769.74 : x
  2. Step 2: Convert to fraction form
    828.60/1,143.34 = 769.74/x
  3. Step 3: Cross multiply
    828.60x = 1,143.34 × 769.74
  4. Step 4: Simplify right side
    828.60x = 880,074.53
  5. Step 5: Solve for x
    x = 880,074.53/828.60
  6. Step 6: Final answer
    x = 1,062.12

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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.