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Finding the Fourth Proportional to 81,128.40, 121,692.60 and 25,724.40

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Solution

The fourth proportional to 81,128.40, 121,692.60 and 25,724.40 is: 38,586.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,128.40 : 121,692.60 = 25,724.40 : x
  2. Step 2: Convert to fraction form
    81,128.40/121,692.60 = 25,724.40/x
  3. Step 3: Cross multiply
    81,128.40x = 121,692.60 × 25,724.40
  4. Step 4: Simplify right side
    81,128.40x = 3,130,469,119.44
  5. Step 5: Solve for x
    x = 3,130,469,119.44/81,128.40
  6. Step 6: Final answer
    x = 38,586.60

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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.