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Finding the Fourth Proportional to 431,390.85, 647,029.58 and 131,901.45

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Solution

The fourth proportional to 431,390.85, 647,029.58 and 131,901.45 is: 197,834.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,390.85 : 647,029.58 = 131,901.45 : x
  2. Step 2: Convert to fraction form
    431,390.85/647,029.58 = 131,901.45/x
  3. Step 3: Cross multiply
    431,390.85x = 647,029.58 × 131,901.45
  4. Step 4: Simplify right side
    431,390.85x = 85,344,139,135.38
  5. Step 5: Solve for x
    x = 85,344,139,135.38/431,390.85
  6. Step 6: Final answer
    x = 197,834.84

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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.