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Finding the Fourth Proportional to 18,879.33, 28,280.12 and 11,069.31

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Solution

The fourth proportional to 18,879.33, 28,280.12 and 11,069.31 is: 16,581.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.33 : 28,280.12 = 11,069.31 : x
  2. Step 2: Convert to fraction form
    18,879.33/28,280.12 = 11,069.31/x
  3. Step 3: Cross multiply
    18,879.33x = 28,280.12 × 11,069.31
  4. Step 4: Simplify right side
    18,879.33x = 313,041,415.12
  5. Step 5: Solve for x
    x = 313,041,415.12/18,879.33
  6. Step 6: Final answer
    x = 16,581.17

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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.