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Finding the Fourth Proportional to 828.42, 1,142.64 and 566.78

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Solution

The fourth proportional to 828.42, 1,142.64 and 566.78 is: 781.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.42 : 1,142.64 = 566.78 : x
  2. Step 2: Convert to fraction form
    828.42/1,142.64 = 566.78/x
  3. Step 3: Cross multiply
    828.42x = 1,142.64 × 566.78
  4. Step 4: Simplify right side
    828.42x = 647,625.50
  5. Step 5: Solve for x
    x = 647,625.50/828.42
  6. Step 6: Final answer
    x = 781.76

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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.