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Finding the Fourth Proportional to 18,966.94, 28,448.28 and 7,271.95

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Solution

The fourth proportional to 18,966.94, 28,448.28 and 7,271.95 is: 10,907.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,966.94 : 28,448.28 = 7,271.95 : x
  2. Step 2: Convert to fraction form
    18,966.94/28,448.28 = 7,271.95/x
  3. Step 3: Cross multiply
    18,966.94x = 28,448.28 × 7,271.95
  4. Step 4: Simplify right side
    18,966.94x = 206,874,469.75
  5. Step 5: Solve for x
    x = 206,874,469.75/18,966.94
  6. Step 6: Final answer
    x = 10,907.11

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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.