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Finding the Fourth Proportional to 18,720.40, 28,048.20 and 11,786.80

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Solution

The fourth proportional to 18,720.40, 28,048.20 and 11,786.80 is: 17,659.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.40 : 28,048.20 = 11,786.80 : x
  2. Step 2: Convert to fraction form
    18,720.40/28,048.20 = 11,786.80/x
  3. Step 3: Cross multiply
    18,720.40x = 28,048.20 × 11,786.80
  4. Step 4: Simplify right side
    18,720.40x = 330,598,523.76
  5. Step 5: Solve for x
    x = 330,598,523.76/18,720.40
  6. Step 6: Final answer
    x = 17,659.80

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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.