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Finding the Fourth Proportional to 45,388.80, 68,083.20 and 20,419.20

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Solution

The fourth proportional to 45,388.80, 68,083.20 and 20,419.20 is: 30,628.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,388.80 : 68,083.20 = 20,419.20 : x
  2. Step 2: Convert to fraction form
    45,388.80/68,083.20 = 20,419.20/x
  3. Step 3: Cross multiply
    45,388.80x = 68,083.20 × 20,419.20
  4. Step 4: Simplify right side
    45,388.80x = 1,390,204,477.44
  5. Step 5: Solve for x
    x = 1,390,204,477.44/45,388.80
  6. Step 6: Final answer
    x = 30,628.80

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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.