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Finding the Fourth Proportional to 139,399.40, 209,107.12 and 39,551.78

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Solution

The fourth proportional to 139,399.40, 209,107.12 and 39,551.78 is: 59,329.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,399.40 : 209,107.12 = 39,551.78 : x
  2. Step 2: Convert to fraction form
    139,399.40/209,107.12 = 39,551.78/x
  3. Step 3: Cross multiply
    139,399.40x = 209,107.12 × 39,551.78
  4. Step 4: Simplify right side
    139,399.40x = 8,270,558,806.67
  5. Step 5: Solve for x
    x = 8,270,558,806.67/139,399.40
  6. Step 6: Final answer
    x = 59,329.95

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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.