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Finding the Fourth Proportional to 128,009.20, 191,754.60 and 88,610.80

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Solution

The fourth proportional to 128,009.20, 191,754.60 and 88,610.80 is: 132,736.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,009.20 : 191,754.60 = 88,610.80 : x
  2. Step 2: Convert to fraction form
    128,009.20/191,754.60 = 88,610.80/x
  3. Step 3: Cross multiply
    128,009.20x = 191,754.60 × 88,610.80
  4. Step 4: Simplify right side
    128,009.20x = 16,991,528,509.68
  5. Step 5: Solve for x
    x = 16,991,528,509.68/128,009.20
  6. Step 6: Final answer
    x = 132,736.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.