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Finding the Fourth Proportional to 290,671.88, 436,009.64 and 80,311.64

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Solution

The fourth proportional to 290,671.88, 436,009.64 and 80,311.64 is: 120,467.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,671.88 : 436,009.64 = 80,311.64 : x
  2. Step 2: Convert to fraction form
    290,671.88/436,009.64 = 80,311.64/x
  3. Step 3: Cross multiply
    290,671.88x = 436,009.64 × 80,311.64
  4. Step 4: Simplify right side
    290,671.88x = 35,016,646,662.60
  5. Step 5: Solve for x
    x = 35,016,646,662.60/290,671.88
  6. Step 6: Final answer
    x = 120,467.96

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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.