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Finding the Fourth Proportional to 25,936.80, 38,905.20 and 8,406.40

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Solution

The fourth proportional to 25,936.80, 38,905.20 and 8,406.40 is: 12,609.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,936.80 : 38,905.20 = 8,406.40 : x
  2. Step 2: Convert to fraction form
    25,936.80/38,905.20 = 8,406.40/x
  3. Step 3: Cross multiply
    25,936.80x = 38,905.20 × 8,406.40
  4. Step 4: Simplify right side
    25,936.80x = 327,052,673.28
  5. Step 5: Solve for x
    x = 327,052,673.28/25,936.80
  6. Step 6: Final answer
    x = 12,609.60

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1.5x scale

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.