Home / 138,942.76-191,738.50-78,512.10

Finding the Fourth Proportional to 138,942.76, 191,738.50 and 78,512.10

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Solution

The fourth proportional to 138,942.76, 191,738.50 and 78,512.10 is: 108,345.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,942.76 : 191,738.50 = 78,512.10 : x
  2. Step 2: Convert to fraction form
    138,942.76/191,738.50 = 78,512.10/x
  3. Step 3: Cross multiply
    138,942.76x = 191,738.50 × 78,512.10
  4. Step 4: Simplify right side
    138,942.76x = 15,053,792,285.85
  5. Step 5: Solve for x
    x = 15,053,792,285.85/138,942.76
  6. Step 6: Final answer
    x = 108,345.28

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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.