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Finding the Fourth Proportional to 139,731.20, 209,580.60 and 39,906.80

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Solution

The fourth proportional to 139,731.20, 209,580.60 and 39,906.80 is: 59,855.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,731.20 : 209,580.60 = 39,906.80 : x
  2. Step 2: Convert to fraction form
    139,731.20/209,580.60 = 39,906.80/x
  3. Step 3: Cross multiply
    139,731.20x = 209,580.60 × 39,906.80
  4. Step 4: Simplify right side
    139,731.20x = 8,363,691,088.08
  5. Step 5: Solve for x
    x = 8,363,691,088.08/139,731.20
  6. Step 6: Final answer
    x = 59,855.57

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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.