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Finding the Fourth Proportional to 128,350.80, 176,879.16 and 111,554.64

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Solution

The fourth proportional to 128,350.80, 176,879.16 and 111,554.64 is: 153,732.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,350.80 : 176,879.16 = 111,554.64 : x
  2. Step 2: Convert to fraction form
    128,350.80/176,879.16 = 111,554.64/x
  3. Step 3: Cross multiply
    128,350.80x = 176,879.16 × 111,554.64
  4. Step 4: Simplify right side
    128,350.80x = 19,731,691,017.30
  5. Step 5: Solve for x
    x = 19,731,691,017.30/128,350.80
  6. Step 6: Final answer
    x = 153,732.51

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1.5x scale

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.