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Finding the Fourth Proportional to 139,065.88, 191,911.28 and 75,403.68

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Solution

The fourth proportional to 139,065.88, 191,911.28 and 75,403.68 is: 104,057.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,065.88 : 191,911.28 = 75,403.68 : x
  2. Step 2: Convert to fraction form
    139,065.88/191,911.28 = 75,403.68/x
  3. Step 3: Cross multiply
    139,065.88x = 191,911.28 × 75,403.68
  4. Step 4: Simplify right side
    139,065.88x = 14,470,816,745.51
  5. Step 5: Solve for x
    x = 14,470,816,745.51/139,065.88
  6. Step 6: Final answer
    x = 104,057.28

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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.