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Finding the Fourth Proportional to 128,107.36, 191,903.48 and 63,871.68

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Solution

The fourth proportional to 128,107.36, 191,903.48 and 63,871.68 is: 95,679.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,107.36 : 191,903.48 = 63,871.68 : x
  2. Step 2: Convert to fraction form
    128,107.36/191,903.48 = 63,871.68/x
  3. Step 3: Cross multiply
    128,107.36x = 191,903.48 × 63,871.68
  4. Step 4: Simplify right side
    128,107.36x = 12,257,197,665.45
  5. Step 5: Solve for x
    x = 12,257,197,665.45/128,107.36
  6. Step 6: Final answer
    x = 95,679.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.