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Finding the Fourth Proportional to 139,991.69, 209,838.99 and 68,813.96

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Solution

The fourth proportional to 139,991.69, 209,838.99 and 68,813.96 is: 103,147.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,991.69 : 209,838.99 = 68,813.96 : x
  2. Step 2: Convert to fraction form
    139,991.69/209,838.99 = 68,813.96/x
  3. Step 3: Cross multiply
    139,991.69x = 209,838.99 × 68,813.96
  4. Step 4: Simplify right side
    139,991.69x = 14,439,851,073.16
  5. Step 5: Solve for x
    x = 14,439,851,073.16/139,991.69
  6. Step 6: Final answer
    x = 103,147.91

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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.