Home / 20,138.53-27,790.40-11,186.61

Finding the Fourth Proportional to 20,138.53, 27,790.40 and 11,186.61

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Solution

The fourth proportional to 20,138.53, 27,790.40 and 11,186.61 is: 15,437.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.53 : 27,790.40 = 11,186.61 : x
  2. Step 2: Convert to fraction form
    20,138.53/27,790.40 = 11,186.61/x
  3. Step 3: Cross multiply
    20,138.53x = 27,790.40 × 11,186.61
  4. Step 4: Simplify right side
    20,138.53x = 310,880,171.66
  5. Step 5: Solve for x
    x = 310,880,171.66/20,138.53
  6. Step 6: Final answer
    x = 15,437.08

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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.