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Finding the Fourth Proportional to 18,897.84, 28,353.24 and 7,212.78

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Solution

The fourth proportional to 18,897.84, 28,353.24 and 7,212.78 is: 10,821.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,897.84 : 28,353.24 = 7,212.78 : x
  2. Step 2: Convert to fraction form
    18,897.84/28,353.24 = 7,212.78/x
  3. Step 3: Cross multiply
    18,897.84x = 28,353.24 × 7,212.78
  4. Step 4: Simplify right side
    18,897.84x = 204,505,682.41
  5. Step 5: Solve for x
    x = 204,505,682.41/18,897.84
  6. Step 6: Final answer
    x = 10,821.64

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1.5x scale

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.