Home / 100,629.18-138,871.62-55,308.78

Finding the Fourth Proportional to 100,629.18, 138,871.62 and 55,308.78

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Solution

The fourth proportional to 100,629.18, 138,871.62 and 55,308.78 is: 76,327.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,629.18 : 138,871.62 = 55,308.78 : x
  2. Step 2: Convert to fraction form
    100,629.18/138,871.62 = 55,308.78/x
  3. Step 3: Cross multiply
    100,629.18x = 138,871.62 × 55,308.78
  4. Step 4: Simplify right side
    100,629.18x = 7,680,819,878.82
  5. Step 5: Solve for x
    x = 7,680,819,878.82/100,629.18
  6. Step 6: Final answer
    x = 76,327.96

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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.