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Finding the Fourth Proportional to 100,629.66, 138,860.52 and 55,305.30

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Solution

The fourth proportional to 100,629.66, 138,860.52 and 55,305.30 is: 76,316.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,629.66 : 138,860.52 = 55,305.30 : x
  2. Step 2: Convert to fraction form
    100,629.66/138,860.52 = 55,305.30/x
  3. Step 3: Cross multiply
    100,629.66x = 138,860.52 × 55,305.30
  4. Step 4: Simplify right side
    100,629.66x = 7,679,722,716.76
  5. Step 5: Solve for x
    x = 7,679,722,716.76/100,629.66
  6. Step 6: Final answer
    x = 76,316.69

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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.