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Finding the Fourth Proportional to 1,200.63, 1,800.98 and 378.91

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Solution

The fourth proportional to 1,200.63, 1,800.98 and 378.91 is: 568.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.63 : 1,800.98 = 378.91 : x
  2. Step 2: Convert to fraction form
    1,200.63/1,800.98 = 378.91/x
  3. Step 3: Cross multiply
    1,200.63x = 1,800.98 × 378.91
  4. Step 4: Simplify right side
    1,200.63x = 682,398.43
  5. Step 5: Solve for x
    x = 682,398.43/1,200.63
  6. Step 6: Final answer
    x = 568.37

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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.