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Finding the Fourth Proportional to 398,907.20, 598,231.20 and 132,622.40

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Solution

The fourth proportional to 398,907.20, 598,231.20 and 132,622.40 is: 198,890.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,907.20 : 598,231.20 = 132,622.40 : x
  2. Step 2: Convert to fraction form
    398,907.20/598,231.20 = 132,622.40/x
  3. Step 3: Cross multiply
    398,907.20x = 598,231.20 × 132,622.40
  4. Step 4: Simplify right side
    398,907.20x = 79,338,857,498.88
  5. Step 5: Solve for x
    x = 79,338,857,498.88/398,907.20
  6. Step 6: Final answer
    x = 198,890.51

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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.