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Finding the Fourth Proportional to 138,648.44, 191,334.96 and 74,986.16

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Solution

The fourth proportional to 138,648.44, 191,334.96 and 74,986.16 is: 103,480.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,648.44 : 191,334.96 = 74,986.16 : x
  2. Step 2: Convert to fraction form
    138,648.44/191,334.96 = 74,986.16/x
  3. Step 3: Cross multiply
    138,648.44x = 191,334.96 × 74,986.16
  4. Step 4: Simplify right side
    138,648.44x = 14,347,473,924.15
  5. Step 5: Solve for x
    x = 14,347,473,924.15/138,648.44
  6. Step 6: Final answer
    x = 103,480.96

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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.