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Finding the Fourth Proportional to 2,879.30, 3,971.31 and 2,133.29

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Solution

The fourth proportional to 2,879.30, 3,971.31 and 2,133.29 is: 2,942.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,879.30 : 3,971.31 = 2,133.29 : x
  2. Step 2: Convert to fraction form
    2,879.30/3,971.31 = 2,133.29/x
  3. Step 3: Cross multiply
    2,879.30x = 3,971.31 × 2,133.29
  4. Step 4: Simplify right side
    2,879.30x = 8,471,955.91
  5. Step 5: Solve for x
    x = 8,471,955.91/2,879.30
  6. Step 6: Final answer
    x = 2,942.37

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1.5x scale

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.