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Finding the Fourth Proportional to 20,696.64, 28,578.24 and 13,636.80

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Solution

The fourth proportional to 20,696.64, 28,578.24 and 13,636.80 is: 18,829.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,696.64 : 28,578.24 = 13,636.80 : x
  2. Step 2: Convert to fraction form
    20,696.64/28,578.24 = 13,636.80/x
  3. Step 3: Cross multiply
    20,696.64x = 28,578.24 × 13,636.80
  4. Step 4: Simplify right side
    20,696.64x = 389,715,743.23
  5. Step 5: Solve for x
    x = 389,715,743.23/20,696.64
  6. Step 6: Final answer
    x = 18,829.90

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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.