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Finding the Fourth Proportional to 92,912.85, 128,272.92 and 61,174

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Solution

The fourth proportional to 92,912.85, 128,272.92 and 61,174 is: 84,455.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,912.85 : 128,272.92 = 61,174 : x
  2. Step 2: Convert to fraction form
    92,912.85/128,272.92 = 61,174/x
  3. Step 3: Cross multiply
    92,912.85x = 128,272.92 × 61,174
  4. Step 4: Simplify right side
    92,912.85x = 7,846,967,608.08
  5. Step 5: Solve for x
    x = 7,846,967,608.08/92,912.85
  6. Step 6: Final answer
    x = 84,455.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.