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Finding the Fourth Proportional to 431,660.40, 647,644.20 and 416,300.40

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Solution

The fourth proportional to 431,660.40, 647,644.20 and 416,300.40 is: 624,598.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,660.40 : 647,644.20 = 416,300.40 : x
  2. Step 2: Convert to fraction form
    431,660.40/647,644.20 = 416,300.40/x
  3. Step 3: Cross multiply
    431,660.40x = 647,644.20 × 416,300.40
  4. Step 4: Simplify right side
    431,660.40x = 269,614,539,517.68
  5. Step 5: Solve for x
    x = 269,614,539,517.68/431,660.40
  6. Step 6: Final answer
    x = 624,598.73

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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.