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Finding the Fourth Proportional to 879.92, 1,326.63 and 820.43

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Solution

The fourth proportional to 879.92, 1,326.63 and 820.43 is: 1,236.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.92 : 1,326.63 = 820.43 : x
  2. Step 2: Convert to fraction form
    879.92/1,326.63 = 820.43/x
  3. Step 3: Cross multiply
    879.92x = 1,326.63 × 820.43
  4. Step 4: Simplify right side
    879.92x = 1,088,410.37
  5. Step 5: Solve for x
    x = 1,088,410.37/879.92
  6. Step 6: Final answer
    x = 1,236.94

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.