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Finding the Fourth Proportional to 279,840.66, 419,820.75 and 90,311.82

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Solution

The fourth proportional to 279,840.66, 419,820.75 and 90,311.82 is: 135,487.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,840.66 : 419,820.75 = 90,311.82 : x
  2. Step 2: Convert to fraction form
    279,840.66/419,820.75 = 90,311.82/x
  3. Step 3: Cross multiply
    279,840.66x = 419,820.75 × 90,311.82
  4. Step 4: Simplify right side
    279,840.66x = 37,914,776,006.27
  5. Step 5: Solve for x
    x = 37,914,776,006.27/279,840.66
  6. Step 6: Final answer
    x = 135,487.02

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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.