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Finding the Fourth Proportional to 20,917.06, 28,879.05 and 12,967.78

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Solution

The fourth proportional to 20,917.06, 28,879.05 and 12,967.78 is: 17,903.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.06 : 28,879.05 = 12,967.78 : x
  2. Step 2: Convert to fraction form
    20,917.06/28,879.05 = 12,967.78/x
  3. Step 3: Cross multiply
    20,917.06x = 28,879.05 × 12,967.78
  4. Step 4: Simplify right side
    20,917.06x = 374,497,167.01
  5. Step 5: Solve for x
    x = 374,497,167.01/20,917.06
  6. Step 6: Final answer
    x = 17,903.91

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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.