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Finding the Fourth Proportional to 431,627.80, 647,441.70 and 221,675.80

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Solution

The fourth proportional to 431,627.80, 647,441.70 and 221,675.80 is: 332,513.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,627.80 : 647,441.70 = 221,675.80 : x
  2. Step 2: Convert to fraction form
    431,627.80/647,441.70 = 221,675.80/x
  3. Step 3: Cross multiply
    431,627.80x = 647,441.70 × 221,675.80
  4. Step 4: Simplify right side
    431,627.80x = 143,522,156,800.86
  5. Step 5: Solve for x
    x = 143,522,156,800.86/431,627.80
  6. Step 6: Final answer
    x = 332,513.70

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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.