Home / 100,220.09-138,305.96-57,198.72

Finding the Fourth Proportional to 100,220.09, 138,305.96 and 57,198.72

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Solution

The fourth proportional to 100,220.09, 138,305.96 and 57,198.72 is: 78,935.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,220.09 : 138,305.96 = 57,198.72 : x
  2. Step 2: Convert to fraction form
    100,220.09/138,305.96 = 57,198.72/x
  3. Step 3: Cross multiply
    100,220.09x = 138,305.96 × 57,198.72
  4. Step 4: Simplify right side
    100,220.09x = 7,910,924,267.75
  5. Step 5: Solve for x
    x = 7,910,924,267.75/100,220.09
  6. Step 6: Final answer
    x = 78,935.51

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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.