Home / 12,138.21-18,212.99-6,291.63

Finding the Fourth Proportional to 12,138.21, 18,212.99 and 6,291.63

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Solution

The fourth proportional to 12,138.21, 18,212.99 and 6,291.63 is: 9,440.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.21 : 18,212.99 = 6,291.63 : x
  2. Step 2: Convert to fraction form
    12,138.21/18,212.99 = 6,291.63/x
  3. Step 3: Cross multiply
    12,138.21x = 18,212.99 × 6,291.63
  4. Step 4: Simplify right side
    12,138.21x = 114,589,362.82
  5. Step 5: Solve for x
    x = 114,589,362.82/12,138.21
  6. Step 6: Final answer
    x = 9,440.38

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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.