Home / 21,832.80-30,127.20-12,399.60

Finding the Fourth Proportional to 21,832.80, 30,127.20 and 12,399.60

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Solution

The fourth proportional to 21,832.80, 30,127.20 and 12,399.60 is: 17,110.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,832.80 : 30,127.20 = 12,399.60 : x
  2. Step 2: Convert to fraction form
    21,832.80/30,127.20 = 12,399.60/x
  3. Step 3: Cross multiply
    21,832.80x = 30,127.20 × 12,399.60
  4. Step 4: Simplify right side
    21,832.80x = 373,565,229.12
  5. Step 5: Solve for x
    x = 373,565,229.12/21,832.80
  6. Step 6: Final answer
    x = 17,110.28

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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.