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Finding the Fourth Proportional to 431,839.21, 647,735.47 and 132,320.67

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Solution

The fourth proportional to 431,839.21, 647,735.47 and 132,320.67 is: 198,473.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,839.21 : 647,735.47 = 132,320.67 : x
  2. Step 2: Convert to fraction form
    431,839.21/647,735.47 = 132,320.67/x
  3. Step 3: Cross multiply
    431,839.21x = 647,735.47 × 132,320.67
  4. Step 4: Simplify right side
    431,839.21x = 85,708,791,042.36
  5. Step 5: Solve for x
    x = 85,708,791,042.36/431,839.21
  6. Step 6: Final answer
    x = 198,473.85

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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.