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Finding the Fourth Proportional to 20,138.40, 30,197.88 and 8,448.48

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Solution

The fourth proportional to 20,138.40, 30,197.88 and 8,448.48 is: 12,668.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.40 : 30,197.88 = 8,448.48 : x
  2. Step 2: Convert to fraction form
    20,138.40/30,197.88 = 8,448.48/x
  3. Step 3: Cross multiply
    20,138.40x = 30,197.88 × 8,448.48
  4. Step 4: Simplify right side
    20,138.40x = 255,126,185.22
  5. Step 5: Solve for x
    x = 255,126,185.22/20,138.40
  6. Step 6: Final answer
    x = 12,668.64

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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.