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Finding the Fourth Proportional to 828.78, 1,242.69 and 341.25

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Solution

The fourth proportional to 828.78, 1,242.69 and 341.25 is: 511.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.78 : 1,242.69 = 341.25 : x
  2. Step 2: Convert to fraction form
    828.78/1,242.69 = 341.25/x
  3. Step 3: Cross multiply
    828.78x = 1,242.69 × 341.25
  4. Step 4: Simplify right side
    828.78x = 424,067.96
  5. Step 5: Solve for x
    x = 424,067.96/828.78
  6. Step 6: Final answer
    x = 511.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.