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Finding the Fourth Proportional to 18,990.96, 28,431.09 and 11,069.25

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Solution

The fourth proportional to 18,990.96, 28,431.09 and 11,069.25 is: 16,571.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.96 : 28,431.09 = 11,069.25 : x
  2. Step 2: Convert to fraction form
    18,990.96/28,431.09 = 11,069.25/x
  3. Step 3: Cross multiply
    18,990.96x = 28,431.09 × 11,069.25
  4. Step 4: Simplify right side
    18,990.96x = 314,710,842.98
  5. Step 5: Solve for x
    x = 314,710,842.98/18,990.96
  6. Step 6: Final answer
    x = 16,571.61

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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.