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Finding the Fourth Proportional to 20,991.56, 28,965.34 and 12,039.44

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Solution

The fourth proportional to 20,991.56, 28,965.34 and 12,039.44 is: 16,612.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.56 : 28,965.34 = 12,039.44 : x
  2. Step 2: Convert to fraction form
    20,991.56/28,965.34 = 12,039.44/x
  3. Step 3: Cross multiply
    20,991.56x = 28,965.34 × 12,039.44
  4. Step 4: Simplify right side
    20,991.56x = 348,726,473.01
  5. Step 5: Solve for x
    x = 348,726,473.01/20,991.56
  6. Step 6: Final answer
    x = 16,612.70

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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.