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Finding the Fourth Proportional to 1,200.60, 1,800.09 and 768.06

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Solution

The fourth proportional to 1,200.60, 1,800.09 and 768.06 is: 1,151.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.60 : 1,800.09 = 768.06 : x
  2. Step 2: Convert to fraction form
    1,200.60/1,800.09 = 768.06/x
  3. Step 3: Cross multiply
    1,200.60x = 1,800.09 × 768.06
  4. Step 4: Simplify right side
    1,200.60x = 1,382,577.13
  5. Step 5: Solve for x
    x = 1,382,577.13/1,200.60
  6. Step 6: Final answer
    x = 1,151.57

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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.