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Finding the Fourth Proportional to 255,901.91, 383,839.01 and 78,409.43

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Solution

The fourth proportional to 255,901.91, 383,839.01 and 78,409.43 is: 117,609.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,901.91 : 383,839.01 = 78,409.43 : x
  2. Step 2: Convert to fraction form
    255,901.91/383,839.01 = 78,409.43/x
  3. Step 3: Cross multiply
    255,901.91x = 383,839.01 × 78,409.43
  4. Step 4: Simplify right side
    255,901.91x = 30,096,597,408.05
  5. Step 5: Solve for x
    x = 30,096,597,408.05/255,901.91
  6. Step 6: Final answer
    x = 117,609.90

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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.