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Finding the Fourth Proportional to 66,199.90, 99,289.59 and 18,817.20

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Solution

The fourth proportional to 66,199.90, 99,289.59 and 18,817.20 is: 28,222.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,199.90 : 99,289.59 = 18,817.20 : x
  2. Step 2: Convert to fraction form
    66,199.90/99,289.59 = 18,817.20/x
  3. Step 3: Cross multiply
    66,199.90x = 99,289.59 × 18,817.20
  4. Step 4: Simplify right side
    66,199.90x = 1,868,351,482.41
  5. Step 5: Solve for x
    x = 1,868,351,482.41/66,199.90
  6. Step 6: Final answer
    x = 28,222.87

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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.