Home / 20,138.37-27,790.18-11,186.45

Finding the Fourth Proportional to 20,138.37, 27,790.18 and 11,186.45

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Solution

The fourth proportional to 20,138.37, 27,790.18 and 11,186.45 is: 15,436.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.37 : 27,790.18 = 11,186.45 : x
  2. Step 2: Convert to fraction form
    20,138.37/27,790.18 = 11,186.45/x
  3. Step 3: Cross multiply
    20,138.37x = 27,790.18 × 11,186.45
  4. Step 4: Simplify right side
    20,138.37x = 310,873,459.06
  5. Step 5: Solve for x
    x = 310,873,459.06/20,138.37
  6. Step 6: Final answer
    x = 15,436.87

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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.