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Finding the Fourth Proportional to 68,468.40, 102,720.60 and 21,721.20

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Solution

The fourth proportional to 68,468.40, 102,720.60 and 21,721.20 is: 32,587.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,468.40 : 102,720.60 = 21,721.20 : x
  2. Step 2: Convert to fraction form
    68,468.40/102,720.60 = 21,721.20/x
  3. Step 3: Cross multiply
    68,468.40x = 102,720.60 × 21,721.20
  4. Step 4: Simplify right side
    68,468.40x = 2,231,214,696.72
  5. Step 5: Solve for x
    x = 2,231,214,696.72/68,468.40
  6. Step 6: Final answer
    x = 32,587.51

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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.