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Finding the Fourth Proportional to 18,682.40, 28,081.20 and 18,336.80

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Solution

The fourth proportional to 18,682.40, 28,081.20 and 18,336.80 is: 27,561.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,682.40 : 28,081.20 = 18,336.80 : x
  2. Step 2: Convert to fraction form
    18,682.40/28,081.20 = 18,336.80/x
  3. Step 3: Cross multiply
    18,682.40x = 28,081.20 × 18,336.80
  4. Step 4: Simplify right side
    18,682.40x = 514,919,348.16
  5. Step 5: Solve for x
    x = 514,919,348.16/18,682.40
  6. Step 6: Final answer
    x = 27,561.73

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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.