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Finding the Fourth Proportional to 398,697.12, 598,161.12 and 118,221.12

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Solution

The fourth proportional to 398,697.12, 598,161.12 and 118,221.12 is: 177,365.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,697.12 : 598,161.12 = 118,221.12 : x
  2. Step 2: Convert to fraction form
    398,697.12/598,161.12 = 118,221.12/x
  3. Step 3: Cross multiply
    398,697.12x = 598,161.12 × 118,221.12
  4. Step 4: Simplify right side
    398,697.12x = 70,715,277,546.85
  5. Step 5: Solve for x
    x = 70,715,277,546.85/398,697.12
  6. Step 6: Final answer
    x = 177,365.91

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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.