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Finding the Fourth Proportional to 68,400.90, 102,600.90 and 18,485.98

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Solution

The fourth proportional to 68,400.90, 102,600.90 and 18,485.98 is: 27,728.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,400.90 : 102,600.90 = 18,485.98 : x
  2. Step 2: Convert to fraction form
    68,400.90/102,600.90 = 18,485.98/x
  3. Step 3: Cross multiply
    68,400.90x = 102,600.90 × 18,485.98
  4. Step 4: Simplify right side
    68,400.90x = 1,896,678,185.38
  5. Step 5: Solve for x
    x = 1,896,678,185.38/68,400.90
  6. Step 6: Final answer
    x = 27,728.85

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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.