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Finding the Fourth Proportional to 20,659.94, 28,509.56 and 11,228.44

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Solution

The fourth proportional to 20,659.94, 28,509.56 and 11,228.44 is: 15,494.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,659.94 : 28,509.56 = 11,228.44 : x
  2. Step 2: Convert to fraction form
    20,659.94/28,509.56 = 11,228.44/x
  3. Step 3: Cross multiply
    20,659.94x = 28,509.56 × 11,228.44
  4. Step 4: Simplify right side
    20,659.94x = 320,117,883.89
  5. Step 5: Solve for x
    x = 320,117,883.89/20,659.94
  6. Step 6: Final answer
    x = 15,494.62

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.