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Finding the Fourth Proportional to 13,636.40, 18,830.16 and 8,609.60

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Solution

The fourth proportional to 13,636.40, 18,830.16 and 8,609.60 is: 11,888.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,636.40 : 18,830.16 = 8,609.60 : x
  2. Step 2: Convert to fraction form
    13,636.40/18,830.16 = 8,609.60/x
  3. Step 3: Cross multiply
    13,636.40x = 18,830.16 × 8,609.60
  4. Step 4: Simplify right side
    13,636.40x = 162,120,145.54
  5. Step 5: Solve for x
    x = 162,120,145.54/13,636.40
  6. Step 6: Final answer
    x = 11,888.78

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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.