Home / 100,665.12-138,906.36-80,514.66

Finding the Fourth Proportional to 100,665.12, 138,906.36 and 80,514.66

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Solution

The fourth proportional to 100,665.12, 138,906.36 and 80,514.66 is: 111,101.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,665.12 : 138,906.36 = 80,514.66 : x
  2. Step 2: Convert to fraction form
    100,665.12/138,906.36 = 80,514.66/x
  3. Step 3: Cross multiply
    100,665.12x = 138,906.36 × 80,514.66
  4. Step 4: Simplify right side
    100,665.12x = 11,183,998,347.24
  5. Step 5: Solve for x
    x = 11,183,998,347.24/100,665.12
  6. Step 6: Final answer
    x = 111,101.03

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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.