Home / 21,858.56-30,163.26-12,905.60

Finding the Fourth Proportional to 21,858.56, 30,163.26 and 12,905.60

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Solution

The fourth proportional to 21,858.56, 30,163.26 and 12,905.60 is: 17,808.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,858.56 : 30,163.26 = 12,905.60 : x
  2. Step 2: Convert to fraction form
    21,858.56/30,163.26 = 12,905.60/x
  3. Step 3: Cross multiply
    21,858.56x = 30,163.26 × 12,905.60
  4. Step 4: Simplify right side
    21,858.56x = 389,274,968.26
  5. Step 5: Solve for x
    x = 389,274,968.26/21,858.56
  6. Step 6: Final answer
    x = 17,808.81

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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.