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Finding the Fourth Proportional to 120,604.56, 180,912.51 and 99,505.50

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Solution

The fourth proportional to 120,604.56, 180,912.51 and 99,505.50 is: 149,262.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,604.56 : 180,912.51 = 99,505.50 : x
  2. Step 2: Convert to fraction form
    120,604.56/180,912.51 = 99,505.50/x
  3. Step 3: Cross multiply
    120,604.56x = 180,912.51 × 99,505.50
  4. Step 4: Simplify right side
    120,604.56x = 18,001,789,763.81
  5. Step 5: Solve for x
    x = 18,001,789,763.81/120,604.56
  6. Step 6: Final answer
    x = 149,262.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.