Home / 13,121.70-18,107.96-7,153.38

Finding the Fourth Proportional to 13,121.70, 18,107.96 and 7,153.38

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Solution

The fourth proportional to 13,121.70, 18,107.96 and 7,153.38 is: 9,871.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.70 : 18,107.96 = 7,153.38 : x
  2. Step 2: Convert to fraction form
    13,121.70/18,107.96 = 7,153.38/x
  3. Step 3: Cross multiply
    13,121.70x = 18,107.96 × 7,153.38
  4. Step 4: Simplify right side
    13,121.70x = 129,533,083.14
  5. Step 5: Solve for x
    x = 129,533,083.14/13,121.70
  6. Step 6: Final answer
    x = 9,871.67

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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.