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Finding the Fourth Proportional to 289,314.40, 433,971.60 and 76,081.90

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Solution

The fourth proportional to 289,314.40, 433,971.60 and 76,081.90 is: 114,122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,314.40 : 433,971.60 = 76,081.90 : x
  2. Step 2: Convert to fraction form
    289,314.40/433,971.60 = 76,081.90/x
  3. Step 3: Cross multiply
    289,314.40x = 433,971.60 × 76,081.90
  4. Step 4: Simplify right side
    289,314.40x = 33,017,383,874.04
  5. Step 5: Solve for x
    x = 33,017,383,874.04/289,314.40
  6. Step 6: Final answer
    x = 114,122.85

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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.