Home / 21,821.08-30,115.90-13,321.42

Finding the Fourth Proportional to 21,821.08, 30,115.90 and 13,321.42

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Solution

The fourth proportional to 21,821.08, 30,115.90 and 13,321.42 is: 18,385.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.08 : 30,115.90 = 13,321.42 : x
  2. Step 2: Convert to fraction form
    21,821.08/30,115.90 = 13,321.42/x
  3. Step 3: Cross multiply
    21,821.08x = 30,115.90 × 13,321.42
  4. Step 4: Simplify right side
    21,821.08x = 401,186,552.58
  5. Step 5: Solve for x
    x = 401,186,552.58/21,821.08
  6. Step 6: Final answer
    x = 18,385.27

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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.