Home / 21,504.80-29,677.92-13,121.36

Finding the Fourth Proportional to 21,504.80, 29,677.92 and 13,121.36

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Solution

The fourth proportional to 21,504.80, 29,677.92 and 13,121.36 is: 18,108.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,504.80 : 29,677.92 = 13,121.36 : x
  2. Step 2: Convert to fraction form
    21,504.80/29,677.92 = 13,121.36/x
  3. Step 3: Cross multiply
    21,504.80x = 29,677.92 × 13,121.36
  4. Step 4: Simplify right side
    21,504.80x = 389,414,672.37
  5. Step 5: Solve for x
    x = 389,414,672.37/21,504.80
  6. Step 6: Final answer
    x = 18,108.27

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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.