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Finding the Fourth Proportional to 138,808.70, 191,555.79 and 75,146.48

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Solution

The fourth proportional to 138,808.70, 191,555.79 and 75,146.48 is: 103,702.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,808.70 : 191,555.79 = 75,146.48 : x
  2. Step 2: Convert to fraction form
    138,808.70/191,555.79 = 75,146.48/x
  3. Step 3: Cross multiply
    138,808.70x = 191,555.79 × 75,146.48
  4. Step 4: Simplify right side
    138,808.70x = 14,394,743,342.12
  5. Step 5: Solve for x
    x = 14,394,743,342.12/138,808.70
  6. Step 6: Final answer
    x = 103,702.03

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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.