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Finding the Fourth Proportional to 128,817.70, 177,732.08 and 83,497.58

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Solution

The fourth proportional to 128,817.70, 177,732.08 and 83,497.58 is: 115,203.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,817.70 : 177,732.08 = 83,497.58 : x
  2. Step 2: Convert to fraction form
    128,817.70/177,732.08 = 83,497.58/x
  3. Step 3: Cross multiply
    128,817.70x = 177,732.08 × 83,497.58
  4. Step 4: Simplify right side
    128,817.70x = 14,840,198,568.37
  5. Step 5: Solve for x
    x = 14,840,198,568.37/128,817.70
  6. Step 6: Final answer
    x = 115,203.10

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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.