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Finding the Fourth Proportional to 20,791.69, 28,693.24 and 11,360.86

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Solution

The fourth proportional to 20,791.69, 28,693.24 and 11,360.86 is: 15,678.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.69 : 28,693.24 = 11,360.86 : x
  2. Step 2: Convert to fraction form
    20,791.69/28,693.24 = 11,360.86/x
  3. Step 3: Cross multiply
    20,791.69x = 28,693.24 × 11,360.86
  4. Step 4: Simplify right side
    20,791.69x = 325,979,782.45
  5. Step 5: Solve for x
    x = 325,979,782.45/20,791.69
  6. Step 6: Final answer
    x = 15,678.37

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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.