Home / 128,787.05-177,792.89-100,042.31

Finding the Fourth Proportional to 128,787.05, 177,792.89 and 100,042.31

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Solution

The fourth proportional to 128,787.05, 177,792.89 and 100,042.31 is: 138,110.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,787.05 : 177,792.89 = 100,042.31 : x
  2. Step 2: Convert to fraction form
    128,787.05/177,792.89 = 100,042.31/x
  3. Step 3: Cross multiply
    128,787.05x = 177,792.89 × 100,042.31
  4. Step 4: Simplify right side
    128,787.05x = 17,786,810,028.00
  5. Step 5: Solve for x
    x = 17,786,810,028.00/128,787.05
  6. Step 6: Final answer
    x = 138,110.24

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1.5x scale

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.