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Finding the Fourth Proportional to 191,638.53, 287,492.49 and 79,257.78

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Solution

The fourth proportional to 191,638.53, 287,492.49 and 79,257.78 is: 118,901.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,638.53 : 287,492.49 = 79,257.78 : x
  2. Step 2: Convert to fraction form
    191,638.53/287,492.49 = 79,257.78/x
  3. Step 3: Cross multiply
    191,638.53x = 287,492.49 × 79,257.78
  4. Step 4: Simplify right side
    191,638.53x = 22,786,016,524.07
  5. Step 5: Solve for x
    x = 22,786,016,524.07/191,638.53
  6. Step 6: Final answer
    x = 118,901.02

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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.