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Finding the Fourth Proportional to 139,052.71, 191,880.93 and 78,614.97

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Solution

The fourth proportional to 139,052.71, 191,880.93 and 78,614.97 is: 108,481.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,052.71 : 191,880.93 = 78,614.97 : x
  2. Step 2: Convert to fraction form
    139,052.71/191,880.93 = 78,614.97/x
  3. Step 3: Cross multiply
    139,052.71x = 191,880.93 × 78,614.97
  4. Step 4: Simplify right side
    139,052.71x = 15,084,713,555.52
  5. Step 5: Solve for x
    x = 15,084,713,555.52/139,052.71
  6. Step 6: Final answer
    x = 108,481.98

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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.