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Finding the Fourth Proportional to 128,841.44, 177,780.69 and 83,581.47

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Solution

The fourth proportional to 128,841.44, 177,780.69 and 83,581.47 is: 115,329.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,841.44 : 177,780.69 = 83,581.47 : x
  2. Step 2: Convert to fraction form
    128,841.44/177,780.69 = 83,581.47/x
  3. Step 3: Cross multiply
    128,841.44x = 177,780.69 × 83,581.47
  4. Step 4: Simplify right side
    128,841.44x = 14,859,171,407.81
  5. Step 5: Solve for x
    x = 14,859,171,407.81/128,841.44
  6. Step 6: Final answer
    x = 115,329.14

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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.