Home / 100,171.28-138,245.64-55,459.28

Finding the Fourth Proportional to 100,171.28, 138,245.64 and 55,459.28

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Solution

The fourth proportional to 100,171.28, 138,245.64 and 55,459.28 is: 76,538.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,171.28 : 138,245.64 = 55,459.28 : x
  2. Step 2: Convert to fraction form
    100,171.28/138,245.64 = 55,459.28/x
  3. Step 3: Cross multiply
    100,171.28x = 138,245.64 × 55,459.28
  4. Step 4: Simplify right side
    100,171.28x = 7,667,003,657.54
  5. Step 5: Solve for x
    x = 7,667,003,657.54/100,171.28
  6. Step 6: Final answer
    x = 76,538.94

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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.