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Finding the Fourth Proportional to 642,180.85, 886,198.49 and 355,694.78

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Solution

The fourth proportional to 642,180.85, 886,198.49 and 355,694.78 is: 490,852.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,180.85 : 886,198.49 = 355,694.78 : x
  2. Step 2: Convert to fraction form
    642,180.85/886,198.49 = 355,694.78/x
  3. Step 3: Cross multiply
    642,180.85x = 886,198.49 × 355,694.78
  4. Step 4: Simplify right side
    642,180.85x = 315,216,177,373.91
  5. Step 5: Solve for x
    x = 315,216,177,373.91/642,180.85
  6. Step 6: Final answer
    x = 490,852.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.