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Finding the Fourth Proportional to 191,818.20, 287,813.70 and 91,939.80

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Solution

The fourth proportional to 191,818.20, 287,813.70 and 91,939.80 is: 137,951.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,818.20 : 287,813.70 = 91,939.80 : x
  2. Step 2: Convert to fraction form
    191,818.20/287,813.70 = 91,939.80/x
  3. Step 3: Cross multiply
    191,818.20x = 287,813.70 × 91,939.80
  4. Step 4: Simplify right side
    191,818.20x = 26,461,534,015.26
  5. Step 5: Solve for x
    x = 26,461,534,015.26/191,818.20
  6. Step 6: Final answer
    x = 137,951.11

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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.