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Finding the Fourth Proportional to 1,200.36, 1,800.47 and 378.61

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Solution

The fourth proportional to 1,200.36, 1,800.47 and 378.61 is: 567.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.36 : 1,800.47 = 378.61 : x
  2. Step 2: Convert to fraction form
    1,200.36/1,800.47 = 378.61/x
  3. Step 3: Cross multiply
    1,200.36x = 1,800.47 × 378.61
  4. Step 4: Simplify right side
    1,200.36x = 681,674.05
  5. Step 5: Solve for x
    x = 681,674.05/1,200.36
  6. Step 6: Final answer
    x = 567.89

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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.