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Finding the Fourth Proportional to 111,907.78, 154,431.93 and 61,605.70

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Solution

The fourth proportional to 111,907.78, 154,431.93 and 61,605.70 is: 85,015.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,907.78 : 154,431.93 = 61,605.70 : x
  2. Step 2: Convert to fraction form
    111,907.78/154,431.93 = 61,605.70/x
  3. Step 3: Cross multiply
    111,907.78x = 154,431.93 × 61,605.70
  4. Step 4: Simplify right side
    111,907.78x = 9,513,887,150.00
  5. Step 5: Solve for x
    x = 9,513,887,150.00/111,907.78
  6. Step 6: Final answer
    x = 85,015.42

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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.