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Finding the Fourth Proportional to 18,629.40, 27,930.78 and 8,763.60

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Solution

The fourth proportional to 18,629.40, 27,930.78 and 8,763.60 is: 13,139.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,629.40 : 27,930.78 = 8,763.60 : x
  2. Step 2: Convert to fraction form
    18,629.40/27,930.78 = 8,763.60/x
  3. Step 3: Cross multiply
    18,629.40x = 27,930.78 × 8,763.60
  4. Step 4: Simplify right side
    18,629.40x = 244,774,183.61
  5. Step 5: Solve for x
    x = 244,774,183.61/18,629.40
  6. Step 6: Final answer
    x = 13,139.13

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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.