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Finding the Fourth Proportional to 139,478.60, 192,478.20 and 75,818

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Solution

The fourth proportional to 139,478.60, 192,478.20 and 75,818 is: 104,627.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,478.60 : 192,478.20 = 75,818 : x
  2. Step 2: Convert to fraction form
    139,478.60/192,478.20 = 75,818/x
  3. Step 3: Cross multiply
    139,478.60x = 192,478.20 × 75,818
  4. Step 4: Simplify right side
    139,478.60x = 14,593,312,167.60
  5. Step 5: Solve for x
    x = 14,593,312,167.60/139,478.60
  6. Step 6: Final answer
    x = 104,627.61

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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.