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Finding the Fourth Proportional to 70,635.92, 105,912.36 and 28,517.38

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Solution

The fourth proportional to 70,635.92, 105,912.36 and 28,517.38 is: 42,759.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,635.92 : 105,912.36 = 28,517.38 : x
  2. Step 2: Convert to fraction form
    70,635.92/105,912.36 = 28,517.38/x
  3. Step 3: Cross multiply
    70,635.92x = 105,912.36 × 28,517.38
  4. Step 4: Simplify right side
    70,635.92x = 3,020,342,752.04
  5. Step 5: Solve for x
    x = 3,020,342,752.04/70,635.92
  6. Step 6: Final answer
    x = 42,759.31

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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.