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Finding the Fourth Proportional to 139,579.78, 209,370.92 and 39,739.90

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Solution

The fourth proportional to 139,579.78, 209,370.92 and 39,739.90 is: 59,610.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,579.78 : 209,370.92 = 39,739.90 : x
  2. Step 2: Convert to fraction form
    139,579.78/209,370.92 = 39,739.90/x
  3. Step 3: Cross multiply
    139,579.78x = 209,370.92 × 39,739.90
  4. Step 4: Simplify right side
    139,579.78x = 8,320,379,423.71
  5. Step 5: Solve for x
    x = 8,320,379,423.71/139,579.78
  6. Step 6: Final answer
    x = 59,610.21

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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.