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Finding the Fourth Proportional to 18,858.41, 28,287.78 and 6,378.50

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Solution

The fourth proportional to 18,858.41, 28,287.78 and 6,378.50 is: 9,567.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.41 : 28,287.78 = 6,378.50 : x
  2. Step 2: Convert to fraction form
    18,858.41/28,287.78 = 6,378.50/x
  3. Step 3: Cross multiply
    18,858.41x = 28,287.78 × 6,378.50
  4. Step 4: Simplify right side
    18,858.41x = 180,433,604.73
  5. Step 5: Solve for x
    x = 180,433,604.73/18,858.41
  6. Step 6: Final answer
    x = 9,567.81

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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.