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Finding the Fourth Proportional to 399,439.88, 551,230.26 and 220,591.88

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Solution

The fourth proportional to 399,439.88, 551,230.26 and 220,591.88 is: 304,418.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,439.88 : 551,230.26 = 220,591.88 : x
  2. Step 2: Convert to fraction form
    399,439.88/551,230.26 = 220,591.88/x
  3. Step 3: Cross multiply
    399,439.88x = 551,230.26 × 220,591.88
  4. Step 4: Simplify right side
    399,439.88x = 121,596,919,366.29
  5. Step 5: Solve for x
    x = 121,596,919,366.29/399,439.88
  6. Step 6: Final answer
    x = 304,418.58

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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.