Home / 20,280.78-27,987.30-11,206.11

Finding the Fourth Proportional to 20,280.78, 27,987.30 and 11,206.11

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Solution

The fourth proportional to 20,280.78, 27,987.30 and 11,206.11 is: 15,464.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.78 : 27,987.30 = 11,206.11 : x
  2. Step 2: Convert to fraction form
    20,280.78/27,987.30 = 11,206.11/x
  3. Step 3: Cross multiply
    20,280.78x = 27,987.30 × 11,206.11
  4. Step 4: Simplify right side
    20,280.78x = 313,628,709.93
  5. Step 5: Solve for x
    x = 313,628,709.93/20,280.78
  6. Step 6: Final answer
    x = 15,464.33

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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.