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Finding the Fourth Proportional to 70,535.43, 105,813.07 and 20,619.38

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Solution

The fourth proportional to 70,535.43, 105,813.07 and 20,619.38 is: 30,931.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,535.43 : 105,813.07 = 20,619.38 : x
  2. Step 2: Convert to fraction form
    70,535.43/105,813.07 = 20,619.38/x
  3. Step 3: Cross multiply
    70,535.43x = 105,813.07 × 20,619.38
  4. Step 4: Simplify right side
    70,535.43x = 2,181,800,112.28
  5. Step 5: Solve for x
    x = 2,181,800,112.28/70,535.43
  6. Step 6: Final answer
    x = 30,931.97

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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.