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Finding the Fourth Proportional to 128,394.64, 177,209.12 and 86,027.04

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Solution

The fourth proportional to 128,394.64, 177,209.12 and 86,027.04 is: 118,733.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,394.64 : 177,209.12 = 86,027.04 : x
  2. Step 2: Convert to fraction form
    128,394.64/177,209.12 = 86,027.04/x
  3. Step 3: Cross multiply
    128,394.64x = 177,209.12 × 86,027.04
  4. Step 4: Simplify right side
    128,394.64x = 15,244,776,054.60
  5. Step 5: Solve for x
    x = 15,244,776,054.60/128,394.64
  6. Step 6: Final answer
    x = 118,733.74

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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.