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Finding the Fourth Proportional to 18,995.58, 28,492.29 and 5,143.50

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Solution

The fourth proportional to 18,995.58, 28,492.29 and 5,143.50 is: 7,714.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.58 : 28,492.29 = 5,143.50 : x
  2. Step 2: Convert to fraction form
    18,995.58/28,492.29 = 5,143.50/x
  3. Step 3: Cross multiply
    18,995.58x = 28,492.29 × 5,143.50
  4. Step 4: Simplify right side
    18,995.58x = 146,550,093.62
  5. Step 5: Solve for x
    x = 146,550,093.62/18,995.58
  6. Step 6: Final answer
    x = 7,714.96

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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.