Home / 100,663.12-138,903.60-80,512.66

Finding the Fourth Proportional to 100,663.12, 138,903.60 and 80,512.66

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Solution

The fourth proportional to 100,663.12, 138,903.60 and 80,512.66 is: 111,098.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,663.12 : 138,903.60 = 80,512.66 : x
  2. Step 2: Convert to fraction form
    100,663.12/138,903.60 = 80,512.66/x
  3. Step 3: Cross multiply
    100,663.12x = 138,903.60 × 80,512.66
  4. Step 4: Simplify right side
    100,663.12x = 11,183,498,319.58
  5. Step 5: Solve for x
    x = 11,183,498,319.58/100,663.12
  6. Step 6: Final answer
    x = 111,098.27

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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.