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Finding the Fourth Proportional to 220,785.40, 331,323.90 and 126,015.40

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Solution

The fourth proportional to 220,785.40, 331,323.90 and 126,015.40 is: 189,106.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,785.40 : 331,323.90 = 126,015.40 : x
  2. Step 2: Convert to fraction form
    220,785.40/331,323.90 = 126,015.40/x
  3. Step 3: Cross multiply
    220,785.40x = 331,323.90 × 126,015.40
  4. Step 4: Simplify right side
    220,785.40x = 41,751,913,788.06
  5. Step 5: Solve for x
    x = 41,751,913,788.06/220,785.40
  6. Step 6: Final answer
    x = 189,106.32

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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.