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Finding the Fourth Proportional to 128,586.88, 177,433.92 and 71,989.12

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Solution

The fourth proportional to 128,586.88, 177,433.92 and 71,989.12 is: 99,336.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,586.88 : 177,433.92 = 71,989.12 : x
  2. Step 2: Convert to fraction form
    128,586.88/177,433.92 = 71,989.12/x
  3. Step 3: Cross multiply
    128,586.88x = 177,433.92 × 71,989.12
  4. Step 4: Simplify right side
    128,586.88x = 12,773,311,758.95
  5. Step 5: Solve for x
    x = 12,773,311,758.95/128,586.88
  6. Step 6: Final answer
    x = 99,336.04

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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.