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Finding the Fourth Proportional to 12,689.25, 18,999.81 and 10,339.62

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Solution

The fourth proportional to 12,689.25, 18,999.81 and 10,339.62 is: 15,481.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.25 : 18,999.81 = 10,339.62 : x
  2. Step 2: Convert to fraction form
    12,689.25/18,999.81 = 10,339.62/x
  3. Step 3: Cross multiply
    12,689.25x = 18,999.81 × 10,339.62
  4. Step 4: Simplify right side
    12,689.25x = 196,450,815.47
  5. Step 5: Solve for x
    x = 196,450,815.47/12,689.25
  6. Step 6: Final answer
    x = 15,481.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.