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Finding the Fourth Proportional to 139,641.96, 192,707.88 and 75,979.80

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Solution

The fourth proportional to 139,641.96, 192,707.88 and 75,979.80 is: 104,853.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,641.96 : 192,707.88 = 75,979.80 : x
  2. Step 2: Convert to fraction form
    139,641.96/192,707.88 = 75,979.80/x
  3. Step 3: Cross multiply
    139,641.96x = 192,707.88 × 75,979.80
  4. Step 4: Simplify right side
    139,641.96x = 14,641,906,180.82
  5. Step 5: Solve for x
    x = 14,641,906,180.82/139,641.96
  6. Step 6: Final answer
    x = 104,853.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.