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Finding the Fourth Proportional to 279,245.85, 418,657.82 and 139,103.61

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Solution

The fourth proportional to 279,245.85, 418,657.82 and 139,103.61 is: 208,550.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,245.85 : 418,657.82 = 139,103.61 : x
  2. Step 2: Convert to fraction form
    279,245.85/418,657.82 = 139,103.61/x
  3. Step 3: Cross multiply
    279,245.85x = 418,657.82 × 139,103.61
  4. Step 4: Simplify right side
    279,245.85x = 58,236,813,421.21
  5. Step 5: Solve for x
    x = 58,236,813,421.21/279,245.85
  6. Step 6: Final answer
    x = 208,550.33

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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.