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Finding the Fourth Proportional to 84,759.21, 126,983.79 and 39,697.86

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Solution

The fourth proportional to 84,759.21, 126,983.79 and 39,697.86 is: 59,474.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,759.21 : 126,983.79 = 39,697.86 : x
  2. Step 2: Convert to fraction form
    84,759.21/126,983.79 = 39,697.86/x
  3. Step 3: Cross multiply
    84,759.21x = 126,983.79 × 39,697.86
  4. Step 4: Simplify right side
    84,759.21x = 5,040,984,717.69
  5. Step 5: Solve for x
    x = 5,040,984,717.69/84,759.21
  6. Step 6: Final answer
    x = 59,474.18

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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.