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Finding the Fourth Proportional to 279,940.10, 419,910.15 and 90,400.10

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Solution

The fourth proportional to 279,940.10, 419,910.15 and 90,400.10 is: 135,600.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,940.10 : 419,910.15 = 90,400.10 : x
  2. Step 2: Convert to fraction form
    279,940.10/419,910.15 = 90,400.10/x
  3. Step 3: Cross multiply
    279,940.10x = 419,910.15 × 90,400.10
  4. Step 4: Simplify right side
    279,940.10x = 37,959,919,551.02
  5. Step 5: Solve for x
    x = 37,959,919,551.02/279,940.10
  6. Step 6: Final answer
    x = 135,600.15

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1.5x scale

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.