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Finding the Fourth Proportional to 68,029.80, 102,044.91 and 20,645.28

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Solution

The fourth proportional to 68,029.80, 102,044.91 and 20,645.28 is: 30,967.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,029.80 : 102,044.91 = 20,645.28 : x
  2. Step 2: Convert to fraction form
    68,029.80/102,044.91 = 20,645.28/x
  3. Step 3: Cross multiply
    68,029.80x = 102,044.91 × 20,645.28
  4. Step 4: Simplify right side
    68,029.80x = 2,106,745,739.52
  5. Step 5: Solve for x
    x = 2,106,745,739.52/68,029.80
  6. Step 6: Final answer
    x = 30,967.98

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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.