Home / 20,091.81-27,727.38-11,138.78

Finding the Fourth Proportional to 20,091.81, 27,727.38 and 11,138.78

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Solution

The fourth proportional to 20,091.81, 27,727.38 and 11,138.78 is: 15,371.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,091.81 : 27,727.38 = 11,138.78 : x
  2. Step 2: Convert to fraction form
    20,091.81/27,727.38 = 11,138.78/x
  3. Step 3: Cross multiply
    20,091.81x = 27,727.38 × 11,138.78
  4. Step 4: Simplify right side
    20,091.81x = 308,849,130.10
  5. Step 5: Solve for x
    x = 308,849,130.10/20,091.81
  6. Step 6: Final answer
    x = 15,371.89

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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.