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Finding the Fourth Proportional to 128,611.78, 177,425.16 and 83,304.88

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Solution

The fourth proportional to 128,611.78, 177,425.16 and 83,304.88 is: 114,922.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.78 : 177,425.16 = 83,304.88 : x
  2. Step 2: Convert to fraction form
    128,611.78/177,425.16 = 83,304.88/x
  3. Step 3: Cross multiply
    128,611.78x = 177,425.16 × 83,304.88
  4. Step 4: Simplify right side
    128,611.78x = 14,780,380,775.66
  5. Step 5: Solve for x
    x = 14,780,380,775.66/128,611.78
  6. Step 6: Final answer
    x = 114,922.45

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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.