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Finding the Fourth Proportional to 399,425.92, 551,212.20 and 218,143.20

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Solution

The fourth proportional to 399,425.92, 551,212.20 and 218,143.20 is: 301,040.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,425.92 : 551,212.20 = 218,143.20 : x
  2. Step 2: Convert to fraction form
    399,425.92/551,212.20 = 218,143.20/x
  3. Step 3: Cross multiply
    399,425.92x = 551,212.20 × 218,143.20
  4. Step 4: Simplify right side
    399,425.92x = 120,243,193,187.04
  5. Step 5: Solve for x
    x = 120,243,193,187.04/399,425.92
  6. Step 6: Final answer
    x = 301,040.04

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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.