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Finding the Fourth Proportional to 18,736.80, 28,105.02 and 4,885.80

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Solution

The fourth proportional to 18,736.80, 28,105.02 and 4,885.80 is: 7,328.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,736.80 : 28,105.02 = 4,885.80 : x
  2. Step 2: Convert to fraction form
    18,736.80/28,105.02 = 4,885.80/x
  3. Step 3: Cross multiply
    18,736.80x = 28,105.02 × 4,885.80
  4. Step 4: Simplify right side
    18,736.80x = 137,315,506.72
  5. Step 5: Solve for x
    x = 137,315,506.72/18,736.80
  6. Step 6: Final answer
    x = 7,328.65

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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.