Home / 100,533.03-138,789.45-77,512.57

Finding the Fourth Proportional to 100,533.03, 138,789.45 and 77,512.57

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Solution

The fourth proportional to 100,533.03, 138,789.45 and 77,512.57 is: 107,008.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,533.03 : 138,789.45 = 77,512.57 : x
  2. Step 2: Convert to fraction form
    100,533.03/138,789.45 = 77,512.57/x
  3. Step 3: Cross multiply
    100,533.03x = 138,789.45 × 77,512.57
  4. Step 4: Simplify right side
    100,533.03x = 10,757,926,958.39
  5. Step 5: Solve for x
    x = 10,757,926,958.39/100,533.03
  6. Step 6: Final answer
    x = 107,008.88

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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.