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Finding the Fourth Proportional to 128,819.16, 177,755.58 and 77,862.60

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Solution

The fourth proportional to 128,819.16, 177,755.58 and 77,862.60 is: 107,441.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,819.16 : 177,755.58 = 77,862.60 : x
  2. Step 2: Convert to fraction form
    128,819.16/177,755.58 = 77,862.60/x
  3. Step 3: Cross multiply
    128,819.16x = 177,755.58 × 77,862.60
  4. Step 4: Simplify right side
    128,819.16x = 13,840,511,623.31
  5. Step 5: Solve for x
    x = 13,840,511,623.31/128,819.16
  6. Step 6: Final answer
    x = 107,441.41

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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.