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Finding the Fourth Proportional to 128,816.70, 177,730.70 and 83,496.58

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Solution

The fourth proportional to 128,816.70, 177,730.70 and 83,496.58 is: 115,201.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,816.70 : 177,730.70 = 83,496.58 : x
  2. Step 2: Convert to fraction form
    128,816.70/177,730.70 = 83,496.58/x
  3. Step 3: Cross multiply
    128,816.70x = 177,730.70 × 83,496.58
  4. Step 4: Simplify right side
    128,816.70x = 14,839,905,611.01
  5. Step 5: Solve for x
    x = 14,839,905,611.01/128,816.70
  6. Step 6: Final answer
    x = 115,201.72

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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.