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Finding the Fourth Proportional to 20,791.76, 28,693.05 and 11,360.93

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Solution

The fourth proportional to 20,791.76, 28,693.05 and 11,360.93 is: 15,678.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.76 : 28,693.05 = 11,360.93 : x
  2. Step 2: Convert to fraction form
    20,791.76/28,693.05 = 11,360.93/x
  3. Step 3: Cross multiply
    20,791.76x = 28,693.05 × 11,360.93
  4. Step 4: Simplify right side
    20,791.76x = 325,979,732.54
  5. Step 5: Solve for x
    x = 325,979,732.54/20,791.76
  6. Step 6: Final answer
    x = 15,678.31

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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.