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Finding the Fourth Proportional to 20,992.16, 28,968.94 and 11,431.94

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Solution

The fourth proportional to 20,992.16, 28,968.94 and 11,431.94 is: 15,775.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.16 : 28,968.94 = 11,431.94 : x
  2. Step 2: Convert to fraction form
    20,992.16/28,968.94 = 11,431.94/x
  3. Step 3: Cross multiply
    20,992.16x = 28,968.94 × 11,431.94
  4. Step 4: Simplify right side
    20,992.16x = 331,171,053.39
  5. Step 5: Solve for x
    x = 331,171,053.39/20,992.16
  6. Step 6: Final answer
    x = 15,775.94

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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.