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Finding the Fourth Proportional to 20,892.64, 28,812.96 and 13,826.08

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Solution

The fourth proportional to 20,892.64, 28,812.96 and 13,826.08 is: 19,067.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,892.64 : 28,812.96 = 13,826.08 : x
  2. Step 2: Convert to fraction form
    20,892.64/28,812.96 = 13,826.08/x
  3. Step 3: Cross multiply
    20,892.64x = 28,812.96 × 13,826.08
  4. Step 4: Simplify right side
    20,892.64x = 398,370,290.00
  5. Step 5: Solve for x
    x = 398,370,290.00/20,892.64
  6. Step 6: Final answer
    x = 19,067.49

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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.