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Finding the Fourth Proportional to 128,640.20, 177,463.91 and 83,333.12

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Solution

The fourth proportional to 128,640.20, 177,463.91 and 83,333.12 is: 114,961.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,640.20 : 177,463.91 = 83,333.12 : x
  2. Step 2: Convert to fraction form
    128,640.20/177,463.91 = 83,333.12/x
  3. Step 3: Cross multiply
    128,640.20x = 177,463.91 × 83,333.12
  4. Step 4: Simplify right side
    128,640.20x = 14,788,620,628.71
  5. Step 5: Solve for x
    x = 14,788,620,628.71/128,640.20
  6. Step 6: Final answer
    x = 114,961.12

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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.