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Finding the Fourth Proportional to 139,480.60, 192,480.96 and 75,820

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Solution

The fourth proportional to 139,480.60, 192,480.96 and 75,820 is: 104,630.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,480.60 : 192,480.96 = 75,820 : x
  2. Step 2: Convert to fraction form
    139,480.60/192,480.96 = 75,820/x
  3. Step 3: Cross multiply
    139,480.60x = 192,480.96 × 75,820
  4. Step 4: Simplify right side
    139,480.60x = 14,593,906,387.20
  5. Step 5: Solve for x
    x = 14,593,906,387.20/139,480.60
  6. Step 6: Final answer
    x = 104,630.37

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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.