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Finding the Fourth Proportional to 139,992.44, 209,840.12 and 68,814.71

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Solution

The fourth proportional to 139,992.44, 209,840.12 and 68,814.71 is: 103,149.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,992.44 : 209,840.12 = 68,814.71 : x
  2. Step 2: Convert to fraction form
    139,992.44/209,840.12 = 68,814.71/x
  3. Step 3: Cross multiply
    139,992.44x = 209,840.12 × 68,814.71
  4. Step 4: Simplify right side
    139,992.44x = 14,440,085,610.89
  5. Step 5: Solve for x
    x = 14,440,085,610.89/139,992.44
  6. Step 6: Final answer
    x = 103,149.04

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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.