Home / 138,308.35-190,884.09-80,965.21

Finding the Fourth Proportional to 138,308.35, 190,884.09 and 80,965.21

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Solution

The fourth proportional to 138,308.35, 190,884.09 and 80,965.21 is: 111,742.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,308.35 : 190,884.09 = 80,965.21 : x
  2. Step 2: Convert to fraction form
    138,308.35/190,884.09 = 80,965.21/x
  3. Step 3: Cross multiply
    138,308.35x = 190,884.09 × 80,965.21
  4. Step 4: Simplify right side
    138,308.35x = 15,454,970,432.51
  5. Step 5: Solve for x
    x = 15,454,970,432.51/138,308.35
  6. Step 6: Final answer
    x = 111,742.86

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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.