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Finding the Fourth Proportional to 1,296.92, 1,790.42 and 879.48

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Solution

The fourth proportional to 1,296.92, 1,790.42 and 879.48 is: 1,214.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.92 : 1,790.42 = 879.48 : x
  2. Step 2: Convert to fraction form
    1,296.92/1,790.42 = 879.48/x
  3. Step 3: Cross multiply
    1,296.92x = 1,790.42 × 879.48
  4. Step 4: Simplify right side
    1,296.92x = 1,574,634.18
  5. Step 5: Solve for x
    x = 1,574,634.18/1,296.92
  6. Step 6: Final answer
    x = 1,214.13

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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.