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Finding the Fourth Proportional to 2,134.94, 2,945.49 and 1,389.92

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Solution

The fourth proportional to 2,134.94, 2,945.49 and 1,389.92 is: 1,917.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,134.94 : 2,945.49 = 1,389.92 : x
  2. Step 2: Convert to fraction form
    2,134.94/2,945.49 = 1,389.92/x
  3. Step 3: Cross multiply
    2,134.94x = 2,945.49 × 1,389.92
  4. Step 4: Simplify right side
    2,134.94x = 4,093,995.46
  5. Step 5: Solve for x
    x = 4,093,995.46/2,134.94
  6. Step 6: Final answer
    x = 1,917.62

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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.