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Finding the Fourth Proportional to 39,817.62, 54,947.14 and 21,912.62

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Solution

The fourth proportional to 39,817.62, 54,947.14 and 21,912.62 is: 30,238.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,817.62 : 54,947.14 = 21,912.62 : x
  2. Step 2: Convert to fraction form
    39,817.62/54,947.14 = 21,912.62/x
  3. Step 3: Cross multiply
    39,817.62x = 54,947.14 × 21,912.62
  4. Step 4: Simplify right side
    39,817.62x = 1,204,035,798.91
  5. Step 5: Solve for x
    x = 1,204,035,798.91/39,817.62
  6. Step 6: Final answer
    x = 30,238.77

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1.5x scale

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.