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Finding the Fourth Proportional to 20,483.40, 30,736.84 and 8,636.34

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Solution

The fourth proportional to 20,483.40, 30,736.84 and 8,636.34 is: 12,959.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,483.40 : 30,736.84 = 8,636.34 : x
  2. Step 2: Convert to fraction form
    20,483.40/30,736.84 = 8,636.34/x
  3. Step 3: Cross multiply
    20,483.40x = 30,736.84 × 8,636.34
  4. Step 4: Simplify right side
    20,483.40x = 265,453,800.77
  5. Step 5: Solve for x
    x = 265,453,800.77/20,483.40
  6. Step 6: Final answer
    x = 12,959.46

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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.