Home / 18,982.21-28,457.12-13,418.05

Finding the Fourth Proportional to 18,982.21, 28,457.12 and 13,418.05

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Solution

The fourth proportional to 18,982.21, 28,457.12 and 13,418.05 is: 20,115.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,982.21 : 28,457.12 = 13,418.05 : x
  2. Step 2: Convert to fraction form
    18,982.21/28,457.12 = 13,418.05/x
  3. Step 3: Cross multiply
    18,982.21x = 28,457.12 × 13,418.05
  4. Step 4: Simplify right side
    18,982.21x = 381,839,059.02
  5. Step 5: Solve for x
    x = 381,839,059.02/18,982.21
  6. Step 6: Final answer
    x = 20,115.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.