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Finding the Fourth Proportional to 128,121.72, 191,883.47 and 101,287.39

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Solution

The fourth proportional to 128,121.72, 191,883.47 and 101,287.39 is: 151,694.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,121.72 : 191,883.47 = 101,287.39 : x
  2. Step 2: Convert to fraction form
    128,121.72/191,883.47 = 101,287.39/x
  3. Step 3: Cross multiply
    128,121.72x = 191,883.47 × 101,287.39
  4. Step 4: Simplify right side
    128,121.72x = 19,435,374,874.30
  5. Step 5: Solve for x
    x = 19,435,374,874.30/128,121.72
  6. Step 6: Final answer
    x = 151,694.61

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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.