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Finding the Fourth Proportional to 128,506.95, 191,840.67 and 111,696.45

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Solution

The fourth proportional to 128,506.95, 191,840.67 and 111,696.45 is: 166,745.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,506.95 : 191,840.67 = 111,696.45 : x
  2. Step 2: Convert to fraction form
    128,506.95/191,840.67 = 111,696.45/x
  3. Step 3: Cross multiply
    128,506.95x = 191,840.67 × 111,696.45
  4. Step 4: Simplify right side
    128,506.95x = 21,427,921,804.62
  5. Step 5: Solve for x
    x = 21,427,921,804.62/128,506.95
  6. Step 6: Final answer
    x = 166,745.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.