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Finding the Fourth Proportional to 191,697.80, 287,546.70 and 86,721.80

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Solution

The fourth proportional to 191,697.80, 287,546.70 and 86,721.80 is: 130,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,697.80 : 287,546.70 = 86,721.80 : x
  2. Step 2: Convert to fraction form
    191,697.80/287,546.70 = 86,721.80/x
  3. Step 3: Cross multiply
    191,697.80x = 287,546.70 × 86,721.80
  4. Step 4: Simplify right side
    191,697.80x = 24,936,567,408.06
  5. Step 5: Solve for x
    x = 24,936,567,408.06/191,697.80
  6. Step 6: Final answer
    x = 130,082.70

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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.