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Finding the Fourth Proportional to 68,742.92, 103,129.08 and 21,356.96

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Solution

The fourth proportional to 68,742.92, 103,129.08 and 21,356.96 is: 32,040.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,742.92 : 103,129.08 = 21,356.96 : x
  2. Step 2: Convert to fraction form
    68,742.92/103,129.08 = 21,356.96/x
  3. Step 3: Cross multiply
    68,742.92x = 103,129.08 × 21,356.96
  4. Step 4: Simplify right side
    68,742.92x = 2,202,523,636.40
  5. Step 5: Solve for x
    x = 2,202,523,636.40/68,742.92
  6. Step 6: Final answer
    x = 32,040.01

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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.