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Finding the Fourth Proportional to 20,954.16, 28,922.22 and 12,991.86

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Solution

The fourth proportional to 20,954.16, 28,922.22 and 12,991.86 is: 17,932.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,954.16 : 28,922.22 = 12,991.86 : x
  2. Step 2: Convert to fraction form
    20,954.16/28,922.22 = 12,991.86/x
  3. Step 3: Cross multiply
    20,954.16x = 28,922.22 × 12,991.86
  4. Step 4: Simplify right side
    20,954.16x = 375,753,433.13
  5. Step 5: Solve for x
    x = 375,753,433.13/20,954.16
  6. Step 6: Final answer
    x = 17,932.16

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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.