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Finding the Fourth Proportional to 1,326.54, 1,830.68 and 828.79

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Solution

The fourth proportional to 1,326.54, 1,830.68 and 828.79 is: 1,143.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.54 : 1,830.68 = 828.79 : x
  2. Step 2: Convert to fraction form
    1,326.54/1,830.68 = 828.79/x
  3. Step 3: Cross multiply
    1,326.54x = 1,830.68 × 828.79
  4. Step 4: Simplify right side
    1,326.54x = 1,517,249.28
  5. Step 5: Solve for x
    x = 1,517,249.28/1,326.54
  6. Step 6: Final answer
    x = 1,143.76

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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.