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Finding the Fourth Proportional to 13,665.11, 18,858.09 and 7,696.99

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Solution

The fourth proportional to 13,665.11, 18,858.09 and 7,696.99 is: 10,621.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,665.11 : 18,858.09 = 7,696.99 : x
  2. Step 2: Convert to fraction form
    13,665.11/18,858.09 = 7,696.99/x
  3. Step 3: Cross multiply
    13,665.11x = 18,858.09 × 7,696.99
  4. Step 4: Simplify right side
    13,665.11x = 145,150,530.15
  5. Step 5: Solve for x
    x = 145,150,530.15/13,665.11
  6. Step 6: Final answer
    x = 10,621.98

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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.