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Finding the Fourth Proportional to 128,578, 192,991.71 and 62,065

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Solution

The fourth proportional to 128,578, 192,991.71 and 62,065 is: 93,157.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578 : 192,991.71 = 62,065 : x
  2. Step 2: Convert to fraction form
    128,578/192,991.71 = 62,065/x
  3. Step 3: Cross multiply
    128,578x = 192,991.71 × 62,065
  4. Step 4: Simplify right side
    128,578x = 11,978,030,481.15
  5. Step 5: Solve for x
    x = 11,978,030,481.15/128,578
  6. Step 6: Final answer
    x = 93,157.70

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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.