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Finding the Fourth Proportional to 20,991.73, 28,969.80 and 12,039.16

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Solution

The fourth proportional to 20,991.73, 28,969.80 and 12,039.16 is: 16,614.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.73 : 28,969.80 = 12,039.16 : x
  2. Step 2: Convert to fraction form
    20,991.73/28,969.80 = 12,039.16/x
  3. Step 3: Cross multiply
    20,991.73x = 28,969.80 × 12,039.16
  4. Step 4: Simplify right side
    20,991.73x = 348,772,057.37
  5. Step 5: Solve for x
    x = 348,772,057.37/20,991.73
  6. Step 6: Final answer
    x = 16,614.74

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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.