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Finding the Fourth Proportional to 39,687.90, 54,769.14 and 21,783.24

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Solution

The fourth proportional to 39,687.90, 54,769.14 and 21,783.24 is: 30,060.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,687.90 : 54,769.14 = 21,783.24 : x
  2. Step 2: Convert to fraction form
    39,687.90/54,769.14 = 21,783.24/x
  3. Step 3: Cross multiply
    39,687.90x = 54,769.14 × 21,783.24
  4. Step 4: Simplify right side
    39,687.90x = 1,193,049,321.21
  5. Step 5: Solve for x
    x = 1,193,049,321.21/39,687.90
  6. Step 6: Final answer
    x = 30,060.78

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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.