Home / 13,138.94-18,131.81-7,170.75

Finding the Fourth Proportional to 13,138.94, 18,131.81 and 7,170.75

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Solution

The fourth proportional to 13,138.94, 18,131.81 and 7,170.75 is: 9,895.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.94 : 18,131.81 = 7,170.75 : x
  2. Step 2: Convert to fraction form
    13,138.94/18,131.81 = 7,170.75/x
  3. Step 3: Cross multiply
    13,138.94x = 18,131.81 × 7,170.75
  4. Step 4: Simplify right side
    13,138.94x = 130,018,640.70
  5. Step 5: Solve for x
    x = 130,018,640.70/13,138.94
  6. Step 6: Final answer
    x = 9,895.67

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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.