Home / 13,121.77-18,107.38-7,455.78

Finding the Fourth Proportional to 13,121.77, 18,107.38 and 7,455.78

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Solution

The fourth proportional to 13,121.77, 18,107.38 and 7,455.78 is: 10,288.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.77 : 18,107.38 = 7,455.78 : x
  2. Step 2: Convert to fraction form
    13,121.77/18,107.38 = 7,455.78/x
  3. Step 3: Cross multiply
    13,121.77x = 18,107.38 × 7,455.78
  4. Step 4: Simplify right side
    13,121.77x = 135,004,641.66
  5. Step 5: Solve for x
    x = 135,004,641.66/13,121.77
  6. Step 6: Final answer
    x = 10,288.60

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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.