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Finding the Fourth Proportional to 399,331.28, 551,078.36 and 218,044.80

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Solution

The fourth proportional to 399,331.28, 551,078.36 and 218,044.80 is: 300,902.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,331.28 : 551,078.36 = 218,044.80 : x
  2. Step 2: Convert to fraction form
    399,331.28/551,078.36 = 218,044.80/x
  3. Step 3: Cross multiply
    399,331.28x = 551,078.36 × 218,044.80
  4. Step 4: Simplify right side
    399,331.28x = 120,159,770,790.53
  5. Step 5: Solve for x
    x = 120,159,770,790.53/399,331.28
  6. Step 6: Final answer
    x = 300,902.48

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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.