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Finding the Fourth Proportional to 640,907.40, 961,288.20 and 167,640.60

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Solution

The fourth proportional to 640,907.40, 961,288.20 and 167,640.60 is: 251,441.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,907.40 : 961,288.20 = 167,640.60 : x
  2. Step 2: Convert to fraction form
    640,907.40/961,288.20 = 167,640.60/x
  3. Step 3: Cross multiply
    640,907.40x = 961,288.20 × 167,640.60
  4. Step 4: Simplify right side
    640,907.40x = 161,150,930,620.92
  5. Step 5: Solve for x
    x = 161,150,930,620.92/640,907.40
  6. Step 6: Final answer
    x = 251,441.83

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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.