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Finding the Fourth Proportional to 431,431.80, 647,147.70 and 115,920.60

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Solution

The fourth proportional to 431,431.80, 647,147.70 and 115,920.60 is: 173,880.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,431.80 : 647,147.70 = 115,920.60 : x
  2. Step 2: Convert to fraction form
    431,431.80/647,147.70 = 115,920.60/x
  3. Step 3: Cross multiply
    431,431.80x = 647,147.70 × 115,920.60
  4. Step 4: Simplify right side
    431,431.80x = 75,017,749,672.62
  5. Step 5: Solve for x
    x = 75,017,749,672.62/431,431.80
  6. Step 6: Final answer
    x = 173,880.90

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Similar ratio
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1.5x scale

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.