Home / 20,942.28-28,907.08-13,408.90

Finding the Fourth Proportional to 20,942.28, 28,907.08 and 13,408.90

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Solution

The fourth proportional to 20,942.28, 28,907.08 and 13,408.90 is: 18,508.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.28 : 28,907.08 = 13,408.90 : x
  2. Step 2: Convert to fraction form
    20,942.28/28,907.08 = 13,408.90/x
  3. Step 3: Cross multiply
    20,942.28x = 28,907.08 × 13,408.90
  4. Step 4: Simplify right side
    20,942.28x = 387,612,145.01
  5. Step 5: Solve for x
    x = 387,612,145.01/20,942.28
  6. Step 6: Final answer
    x = 18,508.59

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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.