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Finding the Fourth Proportional to 18,620.40, 27,930.60 and 4,769.40

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Solution

The fourth proportional to 18,620.40, 27,930.60 and 4,769.40 is: 7,154.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.40 : 27,930.60 = 4,769.40 : x
  2. Step 2: Convert to fraction form
    18,620.40/27,930.60 = 4,769.40/x
  3. Step 3: Cross multiply
    18,620.40x = 27,930.60 × 4,769.40
  4. Step 4: Simplify right side
    18,620.40x = 133,212,203.64
  5. Step 5: Solve for x
    x = 133,212,203.64/18,620.40
  6. Step 6: Final answer
    x = 7,154.10

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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.