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Finding the Fourth Proportional to 20,928.94, 28,881.93 and 11,498.11

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Solution

The fourth proportional to 20,928.94, 28,881.93 and 11,498.11 is: 15,867.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.94 : 28,881.93 = 11,498.11 : x
  2. Step 2: Convert to fraction form
    20,928.94/28,881.93 = 11,498.11/x
  3. Step 3: Cross multiply
    20,928.94x = 28,881.93 × 11,498.11
  4. Step 4: Simplify right side
    20,928.94x = 332,087,579.07
  5. Step 5: Solve for x
    x = 332,087,579.07/20,928.94
  6. Step 6: Final answer
    x = 15,867.39

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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.