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Finding the Fourth Proportional to 235,638.72, 325,182.84 and 128,209.56

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Solution

The fourth proportional to 235,638.72, 325,182.84 and 128,209.56 is: 176,929.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,638.72 : 325,182.84 = 128,209.56 : x
  2. Step 2: Convert to fraction form
    235,638.72/325,182.84 = 128,209.56/x
  3. Step 3: Cross multiply
    235,638.72x = 325,182.84 × 128,209.56
  4. Step 4: Simplify right side
    235,638.72x = 41,691,548,835.95
  5. Step 5: Solve for x
    x = 41,691,548,835.95/235,638.72
  6. Step 6: Final answer
    x = 176,929.96

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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.