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Finding the Fourth Proportional to 128,049.48, 191,918.70 and 90,620.58

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Solution

The fourth proportional to 128,049.48, 191,918.70 and 90,620.58 is: 135,820.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,049.48 : 191,918.70 = 90,620.58 : x
  2. Step 2: Convert to fraction form
    128,049.48/191,918.70 = 90,620.58/x
  3. Step 3: Cross multiply
    128,049.48x = 191,918.70 × 90,620.58
  4. Step 4: Simplify right side
    128,049.48x = 17,391,783,906.85
  5. Step 5: Solve for x
    x = 17,391,783,906.85/128,049.48
  6. Step 6: Final answer
    x = 135,820.81

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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.