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Finding the Fourth Proportional to 100,480.96, 138,665.55 and 55,163.22

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Solution

The fourth proportional to 100,480.96, 138,665.55 and 55,163.22 is: 76,126.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,480.96 : 138,665.55 = 55,163.22 : x
  2. Step 2: Convert to fraction form
    100,480.96/138,665.55 = 55,163.22/x
  3. Step 3: Cross multiply
    100,480.96x = 138,665.55 × 55,163.22
  4. Step 4: Simplify right side
    100,480.96x = 7,649,238,241.07
  5. Step 5: Solve for x
    x = 7,649,238,241.07/100,480.96
  6. Step 6: Final answer
    x = 76,126.25

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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.