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Finding the Fourth Proportional to 101,912.90, 140,540.82 and 79,211.84

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Solution

The fourth proportional to 101,912.90, 140,540.82 and 79,211.84 is: 109,235.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,912.90 : 140,540.82 = 79,211.84 : x
  2. Step 2: Convert to fraction form
    101,912.90/140,540.82 = 79,211.84/x
  3. Step 3: Cross multiply
    101,912.90x = 140,540.82 × 79,211.84
  4. Step 4: Simplify right side
    101,912.90x = 11,132,496,947.31
  5. Step 5: Solve for x
    x = 11,132,496,947.31/101,912.90
  6. Step 6: Final answer
    x = 109,235.41

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1.5x scale

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.