Home / 21,912.87-30,239.96-20,238.60

Finding the Fourth Proportional to 21,912.87, 30,239.96 and 20,238.60

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Solution

The fourth proportional to 21,912.87, 30,239.96 and 20,238.60 is: 27,929.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912.87 : 30,239.96 = 20,238.60 : x
  2. Step 2: Convert to fraction form
    21,912.87/30,239.96 = 20,238.60/x
  3. Step 3: Cross multiply
    21,912.87x = 30,239.96 × 20,238.60
  4. Step 4: Simplify right side
    21,912.87x = 612,014,353.26
  5. Step 5: Solve for x
    x = 612,014,353.26/21,912.87
  6. Step 6: Final answer
    x = 27,929.45

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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.