Home / 21,879.21-30,193.91-13,381.18

Finding the Fourth Proportional to 21,879.21, 30,193.91 and 13,381.18

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Solution

The fourth proportional to 21,879.21, 30,193.91 and 13,381.18 is: 18,466.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.21 : 30,193.91 = 13,381.18 : x
  2. Step 2: Convert to fraction form
    21,879.21/30,193.91 = 13,381.18/x
  3. Step 3: Cross multiply
    21,879.21x = 30,193.91 × 13,381.18
  4. Step 4: Simplify right side
    21,879.21x = 404,030,002.22
  5. Step 5: Solve for x
    x = 404,030,002.22/21,879.21
  6. Step 6: Final answer
    x = 18,466.39

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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.