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Finding the Fourth Proportional to 139,680.78, 192,763.56 and 76,022.70

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Solution

The fourth proportional to 139,680.78, 192,763.56 and 76,022.70 is: 104,913.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,680.78 : 192,763.56 = 76,022.70 : x
  2. Step 2: Convert to fraction form
    139,680.78/192,763.56 = 76,022.70/x
  3. Step 3: Cross multiply
    139,680.78x = 192,763.56 × 76,022.70
  4. Step 4: Simplify right side
    139,680.78x = 14,654,406,292.81
  5. Step 5: Solve for x
    x = 14,654,406,292.81/139,680.78
  6. Step 6: Final answer
    x = 104,913.55

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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.