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Finding the Fourth Proportional to 101,912.40, 140,540.13 and 79,211.34

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Solution

The fourth proportional to 101,912.40, 140,540.13 and 79,211.34 is: 109,234.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,912.40 : 140,540.13 = 79,211.34 : x
  2. Step 2: Convert to fraction form
    101,912.40/140,540.13 = 79,211.34/x
  3. Step 3: Cross multiply
    101,912.40x = 140,540.13 × 79,211.34
  4. Step 4: Simplify right side
    101,912.40x = 11,132,372,021.07
  5. Step 5: Solve for x
    x = 11,132,372,021.07/101,912.40
  6. Step 6: Final answer
    x = 109,234.72

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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.