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Finding the Fourth Proportional to 405,194.60, 607,791.90 and 138,919.40

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Solution

The fourth proportional to 405,194.60, 607,791.90 and 138,919.40 is: 208,379.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,194.60 : 607,791.90 = 138,919.40 : x
  2. Step 2: Convert to fraction form
    405,194.60/607,791.90 = 138,919.40/x
  3. Step 3: Cross multiply
    405,194.60x = 607,791.90 × 138,919.40
  4. Step 4: Simplify right side
    405,194.60x = 84,434,086,072.86
  5. Step 5: Solve for x
    x = 84,434,086,072.86/405,194.60
  6. Step 6: Final answer
    x = 208,379.10

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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.