Home / 21,728.20-29,986.86-12,771.22

Finding the Fourth Proportional to 21,728.20, 29,986.86 and 12,771.22

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Solution

The fourth proportional to 21,728.20, 29,986.86 and 12,771.22 is: 17,625.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,728.20 : 29,986.86 = 12,771.22 : x
  2. Step 2: Convert to fraction form
    21,728.20/29,986.86 = 12,771.22/x
  3. Step 3: Cross multiply
    21,728.20x = 29,986.86 × 12,771.22
  4. Step 4: Simplify right side
    21,728.20x = 382,968,786.17
  5. Step 5: Solve for x
    x = 382,968,786.17/21,728.20
  6. Step 6: Final answer
    x = 17,625.43

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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.