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Finding the Fourth Proportional to 128,578.64, 177,400.14 and 83,184.73

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Solution

The fourth proportional to 128,578.64, 177,400.14 and 83,184.73 is: 114,770.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578.64 : 177,400.14 = 83,184.73 : x
  2. Step 2: Convert to fraction form
    128,578.64/177,400.14 = 83,184.73/x
  3. Step 3: Cross multiply
    128,578.64x = 177,400.14 × 83,184.73
  4. Step 4: Simplify right side
    128,578.64x = 14,756,982,747.86
  5. Step 5: Solve for x
    x = 14,756,982,747.86/128,578.64
  6. Step 6: Final answer
    x = 114,770.10

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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.