Home / 100,112.31-138,170.50-57,091.88

Finding the Fourth Proportional to 100,112.31, 138,170.50 and 57,091.88

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Solution

The fourth proportional to 100,112.31, 138,170.50 and 57,091.88 is: 78,795.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,112.31 : 138,170.50 = 57,091.88 : x
  2. Step 2: Convert to fraction form
    100,112.31/138,170.50 = 57,091.88/x
  3. Step 3: Cross multiply
    100,112.31x = 138,170.50 × 57,091.88
  4. Step 4: Simplify right side
    100,112.31x = 7,888,413,808.24
  5. Step 5: Solve for x
    x = 7,888,413,808.24/100,112.31
  6. Step 6: Final answer
    x = 78,795.64

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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.