Home / 128,914.56-177,783.12-85,918.20

Finding the Fourth Proportional to 128,914.56, 177,783.12 and 85,918.20

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Solution

The fourth proportional to 128,914.56, 177,783.12 and 85,918.20 is: 118,487.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,914.56 : 177,783.12 = 85,918.20 : x
  2. Step 2: Convert to fraction form
    128,914.56/177,783.12 = 85,918.20/x
  3. Step 3: Cross multiply
    128,914.56x = 177,783.12 × 85,918.20
  4. Step 4: Simplify right side
    128,914.56x = 15,274,805,660.78
  5. Step 5: Solve for x
    x = 15,274,805,660.78/128,914.56
  6. Step 6: Final answer
    x = 118,487.82

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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.