Home / 21,119.70-31,656.66-13,729.47

Finding the Fourth Proportional to 21,119.70, 31,656.66 and 13,729.47

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Solution

The fourth proportional to 21,119.70, 31,656.66 and 13,729.47 is: 20,579.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,119.70 : 31,656.66 = 13,729.47 : x
  2. Step 2: Convert to fraction form
    21,119.70/31,656.66 = 13,729.47/x
  3. Step 3: Cross multiply
    21,119.70x = 31,656.66 × 13,729.47
  4. Step 4: Simplify right side
    21,119.70x = 434,629,163.77
  5. Step 5: Solve for x
    x = 434,629,163.77/21,119.70
  6. Step 6: Final answer
    x = 20,579.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.