Home / 13,431.87-20,120.13-7,868.36

Finding the Fourth Proportional to 13,431.87, 20,120.13 and 7,868.36

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Solution

The fourth proportional to 13,431.87, 20,120.13 and 7,868.36 is: 11,786.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.87 : 20,120.13 = 7,868.36 : x
  2. Step 2: Convert to fraction form
    13,431.87/20,120.13 = 7,868.36/x
  3. Step 3: Cross multiply
    13,431.87x = 20,120.13 × 7,868.36
  4. Step 4: Simplify right side
    13,431.87x = 158,312,325.49
  5. Step 5: Solve for x
    x = 158,312,325.49/13,431.87
  6. Step 6: Final answer
    x = 11,786.32

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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.