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Finding the Fourth Proportional to 20,636.96, 28,479.12 and 11,684.48

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Solution

The fourth proportional to 20,636.96, 28,479.12 and 11,684.48 is: 16,124.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.96 : 28,479.12 = 11,684.48 : x
  2. Step 2: Convert to fraction form
    20,636.96/28,479.12 = 11,684.48/x
  3. Step 3: Cross multiply
    20,636.96x = 28,479.12 × 11,684.48
  4. Step 4: Simplify right side
    20,636.96x = 332,763,708.06
  5. Step 5: Solve for x
    x = 332,763,708.06/20,636.96
  6. Step 6: Final answer
    x = 16,124.65

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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.