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Finding the Fourth Proportional to 20,992.78, 28,977.63 and 13,921.54

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Solution

The fourth proportional to 20,992.78, 28,977.63 and 13,921.54 is: 19,216.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.78 : 28,977.63 = 13,921.54 : x
  2. Step 2: Convert to fraction form
    20,992.78/28,977.63 = 13,921.54/x
  3. Step 3: Cross multiply
    20,992.78x = 28,977.63 × 13,921.54
  4. Step 4: Simplify right side
    20,992.78x = 403,413,235.15
  5. Step 5: Solve for x
    x = 403,413,235.15/20,992.78
  6. Step 6: Final answer
    x = 19,216.76

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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.