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Finding the Fourth Proportional to 13,356.25, 20,028.08 and 7,811.28

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Solution

The fourth proportional to 13,356.25, 20,028.08 and 7,811.28 is: 11,713.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,356.25 : 20,028.08 = 7,811.28 : x
  2. Step 2: Convert to fraction form
    13,356.25/20,028.08 = 7,811.28/x
  3. Step 3: Cross multiply
    13,356.25x = 20,028.08 × 7,811.28
  4. Step 4: Simplify right side
    13,356.25x = 156,444,960.27
  5. Step 5: Solve for x
    x = 156,444,960.27/13,356.25
  6. Step 6: Final answer
    x = 11,713.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.