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Finding the Fourth Proportional to 139,690.46, 192,772.90 and 76,028.70

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Solution

The fourth proportional to 139,690.46, 192,772.90 and 76,028.70 is: 104,919.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,690.46 : 192,772.90 = 76,028.70 : x
  2. Step 2: Convert to fraction form
    139,690.46/192,772.90 = 76,028.70/x
  3. Step 3: Cross multiply
    139,690.46x = 192,772.90 × 76,028.70
  4. Step 4: Simplify right side
    139,690.46x = 14,656,272,982.23
  5. Step 5: Solve for x
    x = 14,656,272,982.23/139,690.46
  6. Step 6: Final answer
    x = 104,919.64

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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.