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Finding the Fourth Proportional to 1,351.94, 1,865.66 and 828

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Solution

The fourth proportional to 1,351.94, 1,865.66 and 828 is: 1,142.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.94 : 1,865.66 = 828 : x
  2. Step 2: Convert to fraction form
    1,351.94/1,865.66 = 828/x
  3. Step 3: Cross multiply
    1,351.94x = 1,865.66 × 828
  4. Step 4: Simplify right side
    1,351.94x = 1,544,766.48
  5. Step 5: Solve for x
    x = 1,544,766.48/1,351.94
  6. Step 6: Final answer
    x = 1,142.63

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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.