Home / 20,105.79-27,745.77-11,153.07

Finding the Fourth Proportional to 20,105.79, 27,745.77 and 11,153.07

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Solution

The fourth proportional to 20,105.79, 27,745.77 and 11,153.07 is: 15,391.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,105.79 : 27,745.77 = 11,153.07 : x
  2. Step 2: Convert to fraction form
    20,105.79/27,745.77 = 11,153.07/x
  3. Step 3: Cross multiply
    20,105.79x = 27,745.77 × 11,153.07
  4. Step 4: Simplify right side
    20,105.79x = 309,450,515.01
  5. Step 5: Solve for x
    x = 309,450,515.01/20,105.79
  6. Step 6: Final answer
    x = 15,391.11

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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.