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Finding the Fourth Proportional to 137,187.60, 206,809.64 and 128,043.20

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Solution

The fourth proportional to 137,187.60, 206,809.64 and 128,043.20 is: 193,024.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,187.60 : 206,809.64 = 128,043.20 : x
  2. Step 2: Convert to fraction form
    137,187.60/206,809.64 = 128,043.20/x
  3. Step 3: Cross multiply
    137,187.60x = 206,809.64 × 128,043.20
  4. Step 4: Simplify right side
    137,187.60x = 26,480,568,453.42
  5. Step 5: Solve for x
    x = 26,480,568,453.42/137,187.60
  6. Step 6: Final answer
    x = 193,024.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.