Home / 20,139.37-27,791.56-11,187.45

Finding the Fourth Proportional to 20,139.37, 27,791.56 and 11,187.45

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Solution

The fourth proportional to 20,139.37, 27,791.56 and 11,187.45 is: 15,438.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.37 : 27,791.56 = 11,187.45 : x
  2. Step 2: Convert to fraction form
    20,139.37/27,791.56 = 11,187.45/x
  3. Step 3: Cross multiply
    20,139.37x = 27,791.56 × 11,187.45
  4. Step 4: Simplify right side
    20,139.37x = 310,916,687.92
  5. Step 5: Solve for x
    x = 310,916,687.92/20,139.37
  6. Step 6: Final answer
    x = 15,438.25

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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.