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Finding the Fourth Proportional to 139,672.38, 209,549.88 and 80,550.48

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Solution

The fourth proportional to 139,672.38, 209,549.88 and 80,550.48 is: 120,849.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,672.38 : 209,549.88 = 80,550.48 : x
  2. Step 2: Convert to fraction form
    139,672.38/209,549.88 = 80,550.48/x
  3. Step 3: Cross multiply
    139,672.38x = 209,549.88 × 80,550.48
  4. Step 4: Simplify right side
    139,672.38x = 16,879,343,417.94
  5. Step 5: Solve for x
    x = 16,879,343,417.94/139,672.38
  6. Step 6: Final answer
    x = 120,849.54

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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.