Home / 20,949.75-28,910.79-11,518.65

Finding the Fourth Proportional to 20,949.75, 28,910.79 and 11,518.65

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Solution

The fourth proportional to 20,949.75, 28,910.79 and 11,518.65 is: 15,895.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,949.75 : 28,910.79 = 11,518.65 : x
  2. Step 2: Convert to fraction form
    20,949.75/28,910.79 = 11,518.65/x
  3. Step 3: Cross multiply
    20,949.75x = 28,910.79 × 11,518.65
  4. Step 4: Simplify right side
    20,949.75x = 333,013,271.23
  5. Step 5: Solve for x
    x = 333,013,271.23/20,949.75
  6. Step 6: Final answer
    x = 15,895.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.