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Finding the Fourth Proportional to 39,689.94, 54,772.74 and 21,786.60

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Solution

The fourth proportional to 39,689.94, 54,772.74 and 21,786.60 is: 30,065.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,689.94 : 54,772.74 = 21,786.60 : x
  2. Step 2: Convert to fraction form
    39,689.94/54,772.74 = 21,786.60/x
  3. Step 3: Cross multiply
    39,689.94x = 54,772.74 × 21,786.60
  4. Step 4: Simplify right side
    39,689.94x = 1,193,311,777.28
  5. Step 5: Solve for x
    x = 1,193,311,777.28/39,689.94
  6. Step 6: Final answer
    x = 30,065.85

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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.