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Finding the Fourth Proportional to 128,668.66, 177,614.85 and 83,385.52

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Solution

The fourth proportional to 128,668.66, 177,614.85 and 83,385.52 is: 115,105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,668.66 : 177,614.85 = 83,385.52 : x
  2. Step 2: Convert to fraction form
    128,668.66/177,614.85 = 83,385.52/x
  3. Step 3: Cross multiply
    128,668.66x = 177,614.85 × 83,385.52
  4. Step 4: Simplify right side
    128,668.66x = 14,810,506,626.97
  5. Step 5: Solve for x
    x = 14,810,506,626.97/128,668.66
  6. Step 6: Final answer
    x = 115,105.78

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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.