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Finding the Fourth Proportional to 18,912.72, 28,290.06 and 13,289.98

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Solution

The fourth proportional to 18,912.72, 28,290.06 and 13,289.98 is: 19,879.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.72 : 28,290.06 = 13,289.98 : x
  2. Step 2: Convert to fraction form
    18,912.72/28,290.06 = 13,289.98/x
  3. Step 3: Cross multiply
    18,912.72x = 28,290.06 × 13,289.98
  4. Step 4: Simplify right side
    18,912.72x = 375,974,331.60
  5. Step 5: Solve for x
    x = 375,974,331.60/18,912.72
  6. Step 6: Final answer
    x = 19,879.44

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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.