Home / 1,911.27-2,636.91-1,320.78

Finding the Fourth Proportional to 1,911.27, 2,636.91 and 1,320.78

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Solution

The fourth proportional to 1,911.27, 2,636.91 and 1,320.78 is: 1,822.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.27 : 2,636.91 = 1,320.78 : x
  2. Step 2: Convert to fraction form
    1,911.27/2,636.91 = 1,320.78/x
  3. Step 3: Cross multiply
    1,911.27x = 2,636.91 × 1,320.78
  4. Step 4: Simplify right side
    1,911.27x = 3,482,777.99
  5. Step 5: Solve for x
    x = 3,482,777.99/1,911.27
  6. Step 6: Final answer
    x = 1,822.23

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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.