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Finding the Fourth Proportional to 139,481.63, 209,210.57 and 55,218.88

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Solution

The fourth proportional to 139,481.63, 209,210.57 and 55,218.88 is: 82,823.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,481.63 : 209,210.57 = 55,218.88 : x
  2. Step 2: Convert to fraction form
    139,481.63/209,210.57 = 55,218.88/x
  3. Step 3: Cross multiply
    139,481.63x = 209,210.57 × 55,218.88
  4. Step 4: Simplify right side
    139,481.63x = 11,552,372,037.41
  5. Step 5: Solve for x
    x = 11,552,372,037.41/139,481.63
  6. Step 6: Final answer
    x = 82,823.61

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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.