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Finding the Fourth Proportional to 128,705.33, 177,606.10 and 74,999.09

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Solution

The fourth proportional to 128,705.33, 177,606.10 and 74,999.09 is: 103,494.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,705.33 : 177,606.10 = 74,999.09 : x
  2. Step 2: Convert to fraction form
    128,705.33/177,606.10 = 74,999.09/x
  3. Step 3: Cross multiply
    128,705.33x = 177,606.10 × 74,999.09
  4. Step 4: Simplify right side
    128,705.33x = 13,320,296,416.21
  5. Step 5: Solve for x
    x = 13,320,296,416.21/128,705.33
  6. Step 6: Final answer
    x = 103,494.52

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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.