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Finding the Fourth Proportional to 139,984.71, 209,828.53 and 68,806.97

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Solution

The fourth proportional to 139,984.71, 209,828.53 and 68,806.97 is: 103,137.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,984.71 : 209,828.53 = 68,806.97 : x
  2. Step 2: Convert to fraction form
    139,984.71/209,828.53 = 68,806.97/x
  3. Step 3: Cross multiply
    139,984.71x = 209,828.53 × 68,806.97
  4. Step 4: Simplify right side
    139,984.71x = 14,437,664,805.54
  5. Step 5: Solve for x
    x = 14,437,664,805.54/139,984.71
  6. Step 6: Final answer
    x = 103,137.44

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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.