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Finding the Fourth Proportional to 828.38, 1,142.88 and 496.76

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Solution

The fourth proportional to 828.38, 1,142.88 and 496.76 is: 685.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.38 : 1,142.88 = 496.76 : x
  2. Step 2: Convert to fraction form
    828.38/1,142.88 = 496.76/x
  3. Step 3: Cross multiply
    828.38x = 1,142.88 × 496.76
  4. Step 4: Simplify right side
    828.38x = 567,737.07
  5. Step 5: Solve for x
    x = 567,737.07/828.38
  6. Step 6: Final answer
    x = 685.36

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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.