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Finding the Fourth Proportional to 120,751.36, 180,891.42 and 79,072

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Solution

The fourth proportional to 120,751.36, 180,891.42 and 79,072 is: 118,453.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,751.36 : 180,891.42 = 79,072 : x
  2. Step 2: Convert to fraction form
    120,751.36/180,891.42 = 79,072/x
  3. Step 3: Cross multiply
    120,751.36x = 180,891.42 × 79,072
  4. Step 4: Simplify right side
    120,751.36x = 14,303,446,362.24
  5. Step 5: Solve for x
    x = 14,303,446,362.24/120,751.36
  6. Step 6: Final answer
    x = 118,453.71

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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.