Home / 1,911.75-2,638.22-1,213.13

Finding the Fourth Proportional to 1,911.75, 2,638.22 and 1,213.13

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Solution

The fourth proportional to 1,911.75, 2,638.22 and 1,213.13 is: 1,674.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.75 : 2,638.22 = 1,213.13 : x
  2. Step 2: Convert to fraction form
    1,911.75/2,638.22 = 1,213.13/x
  3. Step 3: Cross multiply
    1,911.75x = 2,638.22 × 1,213.13
  4. Step 4: Simplify right side
    1,911.75x = 3,200,484.57
  5. Step 5: Solve for x
    x = 3,200,484.57/1,911.75
  6. Step 6: Final answer
    x = 1,674.11

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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.