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Finding the Fourth Proportional to 20,937.94, 28,894.37 and 11,507.11

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Solution

The fourth proportional to 20,937.94, 28,894.37 and 11,507.11 is: 15,879.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,937.94 : 28,894.37 = 11,507.11 : x
  2. Step 2: Convert to fraction form
    20,937.94/28,894.37 = 11,507.11/x
  3. Step 3: Cross multiply
    20,937.94x = 28,894.37 × 11,507.11
  4. Step 4: Simplify right side
    20,937.94x = 332,490,564.20
  5. Step 5: Solve for x
    x = 332,490,564.20/20,937.94
  6. Step 6: Final answer
    x = 15,879.81

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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.