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Finding the Fourth Proportional to 68,808.69, 103,204.80 and 21,427.20

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Solution

The fourth proportional to 68,808.69, 103,204.80 and 21,427.20 is: 32,138.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,808.69 : 103,204.80 = 21,427.20 : x
  2. Step 2: Convert to fraction form
    68,808.69/103,204.80 = 21,427.20/x
  3. Step 3: Cross multiply
    68,808.69x = 103,204.80 × 21,427.20
  4. Step 4: Simplify right side
    68,808.69x = 2,211,389,890.56
  5. Step 5: Solve for x
    x = 2,211,389,890.56/68,808.69
  6. Step 6: Final answer
    x = 32,138.24

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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.