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Finding the Fourth Proportional to 20,992.75, 28,972.64 and 12,040.06

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Solution

The fourth proportional to 20,992.75, 28,972.64 and 12,040.06 is: 16,616.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.75 : 28,972.64 = 12,040.06 : x
  2. Step 2: Convert to fraction form
    20,992.75/28,972.64 = 12,040.06/x
  3. Step 3: Cross multiply
    20,992.75x = 28,972.64 × 12,040.06
  4. Step 4: Simplify right side
    20,992.75x = 348,832,251.53
  5. Step 5: Solve for x
    x = 348,832,251.53/20,992.75
  6. Step 6: Final answer
    x = 16,616.80

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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.