Home / 100,687.37-138,809.58-80,338.55

Finding the Fourth Proportional to 100,687.37, 138,809.58 and 80,338.55

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Solution

The fourth proportional to 100,687.37, 138,809.58 and 80,338.55 is: 110,756.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,687.37 : 138,809.58 = 80,338.55 : x
  2. Step 2: Convert to fraction form
    100,687.37/138,809.58 = 80,338.55/x
  3. Step 3: Cross multiply
    100,687.37x = 138,809.58 × 80,338.55
  4. Step 4: Simplify right side
    100,687.37x = 11,151,760,383.31
  5. Step 5: Solve for x
    x = 11,151,760,383.31/100,687.37
  6. Step 6: Final answer
    x = 110,756.30

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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.