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Finding the Fourth Proportional to 18,787.99, 28,194.28 and 7,101.21

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Solution

The fourth proportional to 18,787.99, 28,194.28 and 7,101.21 is: 10,656.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,787.99 : 28,194.28 = 7,101.21 : x
  2. Step 2: Convert to fraction form
    18,787.99/28,194.28 = 7,101.21/x
  3. Step 3: Cross multiply
    18,787.99x = 28,194.28 × 7,101.21
  4. Step 4: Simplify right side
    18,787.99x = 200,213,503.08
  5. Step 5: Solve for x
    x = 200,213,503.08/18,787.99
  6. Step 6: Final answer
    x = 10,656.46

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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.