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Finding the Fourth Proportional to 431,135.40, 646,800.30 and 131,629.80

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Solution

The fourth proportional to 431,135.40, 646,800.30 and 131,629.80 is: 197,474.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,135.40 : 646,800.30 = 131,629.80 : x
  2. Step 2: Convert to fraction form
    431,135.40/646,800.30 = 131,629.80/x
  3. Step 3: Cross multiply
    431,135.40x = 646,800.30 × 131,629.80
  4. Step 4: Simplify right side
    431,135.40x = 85,138,194,128.94
  5. Step 5: Solve for x
    x = 85,138,194,128.94/431,135.40
  6. Step 6: Final answer
    x = 197,474.38

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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.