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Finding the Fourth Proportional to 399,617.80, 598,649.10 and 221,806.60

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Solution

The fourth proportional to 399,617.80, 598,649.10 and 221,806.60 is: 332,278.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,617.80 : 598,649.10 = 221,806.60 : x
  2. Step 2: Convert to fraction form
    399,617.80/598,649.10 = 221,806.60/x
  3. Step 3: Cross multiply
    399,617.80x = 598,649.10 × 221,806.60
  4. Step 4: Simplify right side
    399,617.80x = 132,784,321,464.06
  5. Step 5: Solve for x
    x = 132,784,321,464.06/399,617.80
  6. Step 6: Final answer
    x = 332,278.30

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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.