Home / 13,121.16-18,107.40-7,456.20

Finding the Fourth Proportional to 13,121.16, 18,107.40 and 7,456.20

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Solution

The fourth proportional to 13,121.16, 18,107.40 and 7,456.20 is: 10,289.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.16 : 18,107.40 = 7,456.20 : x
  2. Step 2: Convert to fraction form
    13,121.16/18,107.40 = 7,456.20/x
  3. Step 3: Cross multiply
    13,121.16x = 18,107.40 × 7,456.20
  4. Step 4: Simplify right side
    13,121.16x = 135,012,395.88
  5. Step 5: Solve for x
    x = 135,012,395.88/13,121.16
  6. Step 6: Final answer
    x = 10,289.67

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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.