Home / 138,522.25-191,160.75-78,906.25

Finding the Fourth Proportional to 138,522.25, 191,160.75 and 78,906.25

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Solution

The fourth proportional to 138,522.25, 191,160.75 and 78,906.25 is: 108,890.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,522.25 : 191,160.75 = 78,906.25 : x
  2. Step 2: Convert to fraction form
    138,522.25/191,160.75 = 78,906.25/x
  3. Step 3: Cross multiply
    138,522.25x = 191,160.75 × 78,906.25
  4. Step 4: Simplify right side
    138,522.25x = 15,083,777,929.69
  5. Step 5: Solve for x
    x = 15,083,777,929.69/138,522.25
  6. Step 6: Final answer
    x = 108,890.65

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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.