Home / 21,622.43-29,830.30-13,121.42

Finding the Fourth Proportional to 21,622.43, 29,830.30 and 13,121.42

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Solution

The fourth proportional to 21,622.43, 29,830.30 and 13,121.42 is: 18,102.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,622.43 : 29,830.30 = 13,121.42 : x
  2. Step 2: Convert to fraction form
    21,622.43/29,830.30 = 13,121.42/x
  3. Step 3: Cross multiply
    21,622.43x = 29,830.30 × 13,121.42
  4. Step 4: Simplify right side
    21,622.43x = 391,415,713.07
  5. Step 5: Solve for x
    x = 391,415,713.07/21,622.43
  6. Step 6: Final answer
    x = 18,102.30

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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.