Home / 1,911.91-2,638.31-1,072.61

Finding the Fourth Proportional to 1,911.91, 2,638.31 and 1,072.61

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Solution

The fourth proportional to 1,911.91, 2,638.31 and 1,072.61 is: 1,480.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.91 : 2,638.31 = 1,072.61 : x
  2. Step 2: Convert to fraction form
    1,911.91/2,638.31 = 1,072.61/x
  3. Step 3: Cross multiply
    1,911.91x = 2,638.31 × 1,072.61
  4. Step 4: Simplify right side
    1,911.91x = 2,829,876.45
  5. Step 5: Solve for x
    x = 2,829,876.45/1,911.91
  6. Step 6: Final answer
    x = 1,480.13

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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.