Home / 128,380.78-177,160.26-70,236.58

Finding the Fourth Proportional to 128,380.78, 177,160.26 and 70,236.58

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Solution

The fourth proportional to 128,380.78, 177,160.26 and 70,236.58 is: 96,923.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,380.78 : 177,160.26 = 70,236.58 : x
  2. Step 2: Convert to fraction form
    128,380.78/177,160.26 = 70,236.58/x
  3. Step 3: Cross multiply
    128,380.78x = 177,160.26 × 70,236.58
  4. Step 4: Simplify right side
    128,380.78x = 12,443,130,774.31
  5. Step 5: Solve for x
    x = 12,443,130,774.31/128,380.78
  6. Step 6: Final answer
    x = 96,923.63

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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.