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Finding the Fourth Proportional to 139,129.08, 191,998.16 and 78,698.44

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Solution

The fourth proportional to 139,129.08, 191,998.16 and 78,698.44 is: 108,603.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,129.08 : 191,998.16 = 78,698.44 : x
  2. Step 2: Convert to fraction form
    139,129.08/191,998.16 = 78,698.44/x
  3. Step 3: Cross multiply
    139,129.08x = 191,998.16 × 78,698.44
  4. Step 4: Simplify right side
    139,129.08x = 15,109,955,674.87
  5. Step 5: Solve for x
    x = 15,109,955,674.87/139,129.08
  6. Step 6: Final answer
    x = 108,603.86

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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.