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Finding the Fourth Proportional to 105,391.68, 145,439.46 and 57,645.96

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Solution

The fourth proportional to 105,391.68, 145,439.46 and 57,645.96 is: 79,550.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,391.68 : 145,439.46 = 57,645.96 : x
  2. Step 2: Convert to fraction form
    105,391.68/145,439.46 = 57,645.96/x
  3. Step 3: Cross multiply
    105,391.68x = 145,439.46 × 57,645.96
  4. Step 4: Simplify right side
    105,391.68x = 8,383,997,293.58
  5. Step 5: Solve for x
    x = 8,383,997,293.58/105,391.68
  6. Step 6: Final answer
    x = 79,550.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.