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Finding the Fourth Proportional to 128,698.35, 177,542.28 and 85,697.67

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Solution

The fourth proportional to 128,698.35, 177,542.28 and 85,697.67 is: 118,221.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,698.35 : 177,542.28 = 85,697.67 : x
  2. Step 2: Convert to fraction form
    128,698.35/177,542.28 = 85,697.67/x
  3. Step 3: Cross multiply
    128,698.35x = 177,542.28 × 85,697.67
  4. Step 4: Simplify right side
    128,698.35x = 15,214,959,722.49
  5. Step 5: Solve for x
    x = 15,214,959,722.49/128,698.35
  6. Step 6: Final answer
    x = 118,221.87

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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.