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Finding the Fourth Proportional to 13,629.11, 18,810.09 and 7,661.16

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Solution

The fourth proportional to 13,629.11, 18,810.09 and 7,661.16 is: 10,573.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,629.11 : 18,810.09 = 7,661.16 : x
  2. Step 2: Convert to fraction form
    13,629.11/18,810.09 = 7,661.16/x
  3. Step 3: Cross multiply
    13,629.11x = 18,810.09 × 7,661.16
  4. Step 4: Simplify right side
    13,629.11x = 144,107,109.10
  5. Step 5: Solve for x
    x = 144,107,109.10/13,629.11
  6. Step 6: Final answer
    x = 10,573.48

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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.