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Finding the Fourth Proportional to 139,788.68, 192,911.44 and 76,126.48

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Solution

The fourth proportional to 139,788.68, 192,911.44 and 76,126.48 is: 105,056.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,788.68 : 192,911.44 = 76,126.48 : x
  2. Step 2: Convert to fraction form
    139,788.68/192,911.44 = 76,126.48/x
  3. Step 3: Cross multiply
    139,788.68x = 192,911.44 × 76,126.48
  4. Step 4: Simplify right side
    139,788.68x = 14,685,668,878.93
  5. Step 5: Solve for x
    x = 14,685,668,878.93/139,788.68
  6. Step 6: Final answer
    x = 105,056.21

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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.