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Finding the Fourth Proportional to 279,991.90, 419,987.85 and 210,007.90

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Solution

The fourth proportional to 279,991.90, 419,987.85 and 210,007.90 is: 315,011.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,991.90 : 419,987.85 = 210,007.90 : x
  2. Step 2: Convert to fraction form
    279,991.90/419,987.85 = 210,007.90/x
  3. Step 3: Cross multiply
    279,991.90x = 419,987.85 × 210,007.90
  4. Step 4: Simplify right side
    279,991.90x = 88,200,766,404.02
  5. Step 5: Solve for x
    x = 88,200,766,404.02/279,991.90
  6. Step 6: Final answer
    x = 315,011.85

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Similar ratio
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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.