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Finding the Fourth Proportional to 828.30, 1,143.12 and 496.74

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Solution

The fourth proportional to 828.30, 1,143.12 and 496.74 is: 685.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.30 : 1,143.12 = 496.74 : x
  2. Step 2: Convert to fraction form
    828.30/1,143.12 = 496.74/x
  3. Step 3: Cross multiply
    828.30x = 1,143.12 × 496.74
  4. Step 4: Simplify right side
    828.30x = 567,833.43
  5. Step 5: Solve for x
    x = 567,833.43/828.30
  6. Step 6: Final answer
    x = 685.54

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1.5x scale

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.