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Finding the Fourth Proportional to 68,379.98, 102,578.15 and 20,988.88

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Solution

The fourth proportional to 68,379.98, 102,578.15 and 20,988.88 is: 31,485.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,379.98 : 102,578.15 = 20,988.88 : x
  2. Step 2: Convert to fraction form
    68,379.98/102,578.15 = 20,988.88/x
  3. Step 3: Cross multiply
    68,379.98x = 102,578.15 × 20,988.88
  4. Step 4: Simplify right side
    68,379.98x = 2,153,000,277.00
  5. Step 5: Solve for x
    x = 2,153,000,277.00/68,379.98
  6. Step 6: Final answer
    x = 31,485.83

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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.