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Finding the Fourth Proportional to 128,992.67, 178,003.88 and 71,635.62

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Solution

The fourth proportional to 128,992.67, 178,003.88 and 71,635.62 is: 98,853.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,992.67 : 178,003.88 = 71,635.62 : x
  2. Step 2: Convert to fraction form
    128,992.67/178,003.88 = 71,635.62/x
  3. Step 3: Cross multiply
    128,992.67x = 178,003.88 × 71,635.62
  4. Step 4: Simplify right side
    128,992.67x = 12,751,417,948.03
  5. Step 5: Solve for x
    x = 12,751,417,948.03/128,992.67
  6. Step 6: Final answer
    x = 98,853.82

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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.