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Finding the Fourth Proportional to 138,648.74, 191,335.26 and 74,986.54

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Solution

The fourth proportional to 138,648.74, 191,335.26 and 74,986.54 is: 103,481.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,648.74 : 191,335.26 = 74,986.54 : x
  2. Step 2: Convert to fraction form
    138,648.74/191,335.26 = 74,986.54/x
  3. Step 3: Cross multiply
    138,648.74x = 191,335.26 × 74,986.54
  4. Step 4: Simplify right side
    138,648.74x = 14,347,568,649.06
  5. Step 5: Solve for x
    x = 14,347,568,649.06/138,648.74
  6. Step 6: Final answer
    x = 103,481.42

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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.