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Finding the Fourth Proportional to 828.28, 1,142.22 and 688.60

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Solution

The fourth proportional to 828.28, 1,142.22 and 688.60 is: 949.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.28 : 1,142.22 = 688.60 : x
  2. Step 2: Convert to fraction form
    828.28/1,142.22 = 688.60/x
  3. Step 3: Cross multiply
    828.28x = 1,142.22 × 688.60
  4. Step 4: Simplify right side
    828.28x = 786,532.69
  5. Step 5: Solve for x
    x = 786,532.69/828.28
  6. Step 6: Final answer
    x = 949.60

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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.