Home / 138,515.12-191,126.76-81,905.84

Finding the Fourth Proportional to 138,515.12, 191,126.76 and 81,905.84

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Solution

The fourth proportional to 138,515.12, 191,126.76 and 81,905.84 is: 113,015.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,515.12 : 191,126.76 = 81,905.84 : x
  2. Step 2: Convert to fraction form
    138,515.12/191,126.76 = 81,905.84/x
  3. Step 3: Cross multiply
    138,515.12x = 191,126.76 × 81,905.84
  4. Step 4: Simplify right side
    138,515.12x = 15,654,397,824.28
  5. Step 5: Solve for x
    x = 15,654,397,824.28/138,515.12
  6. Step 6: Final answer
    x = 113,015.81

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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.