Home / 138,940.18-191,744.91-78,513.37

Finding the Fourth Proportional to 138,940.18, 191,744.91 and 78,513.37

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Solution

The fourth proportional to 138,940.18, 191,744.91 and 78,513.37 is: 108,352.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,940.18 : 191,744.91 = 78,513.37 : x
  2. Step 2: Convert to fraction form
    138,940.18/191,744.91 = 78,513.37/x
  3. Step 3: Cross multiply
    138,940.18x = 191,744.91 × 78,513.37
  4. Step 4: Simplify right side
    138,940.18x = 15,054,539,064.45
  5. Step 5: Solve for x
    x = 15,054,539,064.45/138,940.18
  6. Step 6: Final answer
    x = 108,352.67

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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.