Home / 21,012.75-28,997.69-11,581.11

Finding the Fourth Proportional to 21,012.75, 28,997.69 and 11,581.11

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Solution

The fourth proportional to 21,012.75, 28,997.69 and 11,581.11 is: 15,981.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.75 : 28,997.69 = 11,581.11 : x
  2. Step 2: Convert to fraction form
    21,012.75/28,997.69 = 11,581.11/x
  3. Step 3: Cross multiply
    21,012.75x = 28,997.69 × 11,581.11
  4. Step 4: Simplify right side
    21,012.75x = 335,825,379.73
  5. Step 5: Solve for x
    x = 335,825,379.73/21,012.75
  6. Step 6: Final answer
    x = 15,981.98

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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.