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Finding the Fourth Proportional to 18,821.34, 28,240.11 and 7,137.90

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Solution

The fourth proportional to 18,821.34, 28,240.11 and 7,137.90 is: 10,709.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.34 : 28,240.11 = 7,137.90 : x
  2. Step 2: Convert to fraction form
    18,821.34/28,240.11 = 7,137.90/x
  3. Step 3: Cross multiply
    18,821.34x = 28,240.11 × 7,137.90
  4. Step 4: Simplify right side
    18,821.34x = 201,575,081.17
  5. Step 5: Solve for x
    x = 201,575,081.17/18,821.34
  6. Step 6: Final answer
    x = 10,709.92

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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.