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Finding the Fourth Proportional to 18,820, 28,230 and 4,969

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Solution

The fourth proportional to 18,820, 28,230 and 4,969 is: 7,453.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,820 : 28,230 = 4,969 : x
  2. Step 2: Convert to fraction form
    18,820/28,230 = 4,969/x
  3. Step 3: Cross multiply
    18,820x = 28,230 × 4,969
  4. Step 4: Simplify right side
    18,820x = 140,274,870
  5. Step 5: Solve for x
    x = 140,274,870/18,820
  6. Step 6: Final answer
    x = 7,453.50

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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.