Home / 138,376.14-190,961.19-81,792.78

Finding the Fourth Proportional to 138,376.14, 190,961.19 and 81,792.78

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Solution

The fourth proportional to 138,376.14, 190,961.19 and 81,792.78 is: 112,875.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,376.14 : 190,961.19 = 81,792.78 : x
  2. Step 2: Convert to fraction form
    138,376.14/190,961.19 = 81,792.78/x
  3. Step 3: Cross multiply
    138,376.14x = 190,961.19 × 81,792.78
  4. Step 4: Simplify right side
    138,376.14x = 15,619,246,602.21
  5. Step 5: Solve for x
    x = 15,619,246,602.21/138,376.14
  6. Step 6: Final answer
    x = 112,875.29

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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.