Home / 20,997.51-28,971.52-11,920.85

Finding the Fourth Proportional to 20,997.51, 28,971.52 and 11,920.85

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Solution

The fourth proportional to 20,997.51, 28,971.52 and 11,920.85 is: 16,447.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,997.51 : 28,971.52 = 11,920.85 : x
  2. Step 2: Convert to fraction form
    20,997.51/28,971.52 = 11,920.85/x
  3. Step 3: Cross multiply
    20,997.51x = 28,971.52 × 11,920.85
  4. Step 4: Simplify right side
    20,997.51x = 345,365,308.20
  5. Step 5: Solve for x
    x = 345,365,308.20/20,997.51
  6. Step 6: Final answer
    x = 16,447.92

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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.