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Finding the Fourth Proportional to 13,628.72, 18,808 and 7,660.92

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Solution

The fourth proportional to 13,628.72, 18,808 and 7,660.92 is: 10,572.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,628.72 : 18,808 = 7,660.92 : x
  2. Step 2: Convert to fraction form
    13,628.72/18,808 = 7,660.92/x
  3. Step 3: Cross multiply
    13,628.72x = 18,808 × 7,660.92
  4. Step 4: Simplify right side
    13,628.72x = 144,086,583.36
  5. Step 5: Solve for x
    x = 144,086,583.36/13,628.72
  6. Step 6: Final answer
    x = 10,572.28

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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.