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Finding the Fourth Proportional to 191,912.70, 287,501.85 and 103,136.70

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Solution

The fourth proportional to 191,912.70, 287,501.85 and 103,136.70 is: 154,507.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,912.70 : 287,501.85 = 103,136.70 : x
  2. Step 2: Convert to fraction form
    191,912.70/287,501.85 = 103,136.70/x
  3. Step 3: Cross multiply
    191,912.70x = 287,501.85 × 103,136.70
  4. Step 4: Simplify right side
    191,912.70x = 29,651,992,052.90
  5. Step 5: Solve for x
    x = 29,651,992,052.90/191,912.70
  6. Step 6: Final answer
    x = 154,507.71

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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.