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Finding the Fourth Proportional to 20,893.70, 28,835.28 and 11,939.47

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Solution

The fourth proportional to 20,893.70, 28,835.28 and 11,939.47 is: 16,477.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,893.70 : 28,835.28 = 11,939.47 : x
  2. Step 2: Convert to fraction form
    20,893.70/28,835.28 = 11,939.47/x
  3. Step 3: Cross multiply
    20,893.70x = 28,835.28 × 11,939.47
  4. Step 4: Simplify right side
    20,893.70x = 344,277,756.63
  5. Step 5: Solve for x
    x = 344,277,756.63/20,893.70
  6. Step 6: Final answer
    x = 16,477.59

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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.