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Finding the Fourth Proportional to 128,361.41, 177,079.80 and 83,054.16

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Solution

The fourth proportional to 128,361.41, 177,079.80 and 83,054.16 is: 114,576.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,361.41 : 177,079.80 = 83,054.16 : x
  2. Step 2: Convert to fraction form
    128,361.41/177,079.80 = 83,054.16/x
  3. Step 3: Cross multiply
    128,361.41x = 177,079.80 × 83,054.16
  4. Step 4: Simplify right side
    128,361.41x = 14,707,214,041.97
  5. Step 5: Solve for x
    x = 14,707,214,041.97/128,361.41
  6. Step 6: Final answer
    x = 114,576.61

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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.