Home / 20,408.78-28,165.38-13,591.11

Finding the Fourth Proportional to 20,408.78, 28,165.38 and 13,591.11

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Solution

The fourth proportional to 20,408.78, 28,165.38 and 13,591.11 is: 18,756.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,408.78 : 28,165.38 = 13,591.11 : x
  2. Step 2: Convert to fraction form
    20,408.78/28,165.38 = 13,591.11/x
  3. Step 3: Cross multiply
    20,408.78x = 28,165.38 × 13,591.11
  4. Step 4: Simplify right side
    20,408.78x = 382,798,709.82
  5. Step 5: Solve for x
    x = 382,798,709.82/20,408.78
  6. Step 6: Final answer
    x = 18,756.57

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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.