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Finding the Fourth Proportional to 68,828.69, 103,236.95 and 21,441.80

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Solution

The fourth proportional to 68,828.69, 103,236.95 and 21,441.80 is: 32,160.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,828.69 : 103,236.95 = 21,441.80 : x
  2. Step 2: Convert to fraction form
    68,828.69/103,236.95 = 21,441.80/x
  3. Step 3: Cross multiply
    68,828.69x = 103,236.95 × 21,441.80
  4. Step 4: Simplify right side
    68,828.69x = 2,213,585,411.12
  5. Step 5: Solve for x
    x = 2,213,585,411.12/68,828.69
  6. Step 6: Final answer
    x = 32,160.80

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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.