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Finding the Fourth Proportional to 20,992.28, 28,968.30 and 13,540.28

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Solution

The fourth proportional to 20,992.28, 28,968.30 and 13,540.28 is: 18,684.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.28 : 28,968.30 = 13,540.28 : x
  2. Step 2: Convert to fraction form
    20,992.28/28,968.30 = 13,540.28/x
  3. Step 3: Cross multiply
    20,992.28x = 28,968.30 × 13,540.28
  4. Step 4: Simplify right side
    20,992.28x = 392,238,893.12
  5. Step 5: Solve for x
    x = 392,238,893.12/20,992.28
  6. Step 6: Final answer
    x = 18,684.91

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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.