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Finding the Fourth Proportional to 399,478.56, 551,280.39 and 218,190.92

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Solution

The fourth proportional to 399,478.56, 551,280.39 and 218,190.92 is: 301,103.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,478.56 : 551,280.39 = 218,190.92 : x
  2. Step 2: Convert to fraction form
    399,478.56/551,280.39 = 218,190.92/x
  3. Step 3: Cross multiply
    399,478.56x = 551,280.39 × 218,190.92
  4. Step 4: Simplify right side
    399,478.56x = 120,284,373,431.60
  5. Step 5: Solve for x
    x = 120,284,373,431.60/399,478.56
  6. Step 6: Final answer
    x = 301,103.45

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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.