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Finding the Fourth Proportional to 13,659.90, 20,486.97 and 6,636.90

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Solution

The fourth proportional to 13,659.90, 20,486.97 and 6,636.90 is: 9,953.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,659.90 : 20,486.97 = 6,636.90 : x
  2. Step 2: Convert to fraction form
    13,659.90/20,486.97 = 6,636.90/x
  3. Step 3: Cross multiply
    13,659.90x = 20,486.97 × 6,636.90
  4. Step 4: Simplify right side
    13,659.90x = 135,969,971.19
  5. Step 5: Solve for x
    x = 135,969,971.19/13,659.90
  6. Step 6: Final answer
    x = 9,953.95

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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.