Home / 139,129.10-191,998.14-78,698.44

Finding the Fourth Proportional to 139,129.10, 191,998.14 and 78,698.44

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Solution

The fourth proportional to 139,129.10, 191,998.14 and 78,698.44 is: 108,603.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,129.10 : 191,998.14 = 78,698.44 : x
  2. Step 2: Convert to fraction form
    139,129.10/191,998.14 = 78,698.44/x
  3. Step 3: Cross multiply
    139,129.10x = 191,998.14 × 78,698.44
  4. Step 4: Simplify right side
    139,129.10x = 15,109,954,100.90
  5. Step 5: Solve for x
    x = 15,109,954,100.90/139,129.10
  6. Step 6: Final answer
    x = 108,603.84

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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.