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Finding the Fourth Proportional to 139,991.32, 209,838.43 and 68,813.58

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Solution

The fourth proportional to 139,991.32, 209,838.43 and 68,813.58 is: 103,147.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,991.32 : 209,838.43 = 68,813.58 : x
  2. Step 2: Convert to fraction form
    139,991.32/209,838.43 = 68,813.58/x
  3. Step 3: Cross multiply
    139,991.32x = 209,838.43 × 68,813.58
  4. Step 4: Simplify right side
    139,991.32x = 14,439,733,675.90
  5. Step 5: Solve for x
    x = 14,439,733,675.90/139,991.32
  6. Step 6: Final answer
    x = 103,147.35

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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.