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Finding the Fourth Proportional to 139,803.06, 209,669.40 and 39,963.78

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Solution

The fourth proportional to 139,803.06, 209,669.40 and 39,963.78 is: 59,935.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,803.06 : 209,669.40 = 39,963.78 : x
  2. Step 2: Convert to fraction form
    139,803.06/209,669.40 = 39,963.78/x
  3. Step 3: Cross multiply
    139,803.06x = 209,669.40 × 39,963.78
  4. Step 4: Simplify right side
    139,803.06x = 8,379,181,774.33
  5. Step 5: Solve for x
    x = 8,379,181,774.33/139,803.06
  6. Step 6: Final answer
    x = 59,935.61

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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.