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Finding the Fourth Proportional to 18,636.80, 25,719.36 and 10,139.54

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Solution

The fourth proportional to 18,636.80, 25,719.36 and 10,139.54 is: 13,992.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,636.80 : 25,719.36 = 10,139.54 : x
  2. Step 2: Convert to fraction form
    18,636.80/25,719.36 = 10,139.54/x
  3. Step 3: Cross multiply
    18,636.80x = 25,719.36 × 10,139.54
  4. Step 4: Simplify right side
    18,636.80x = 260,782,479.49
  5. Step 5: Solve for x
    x = 260,782,479.49/18,636.80
  6. Step 6: Final answer
    x = 13,992.88

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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.