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Finding the Fourth Proportional to 1,200.79, 1,800.60 and 378.64

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Solution

The fourth proportional to 1,200.79, 1,800.60 and 378.64 is: 567.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.79 : 1,800.60 = 378.64 : x
  2. Step 2: Convert to fraction form
    1,200.79/1,800.60 = 378.64/x
  3. Step 3: Cross multiply
    1,200.79x = 1,800.60 × 378.64
  4. Step 4: Simplify right side
    1,200.79x = 681,779.18
  5. Step 5: Solve for x
    x = 681,779.18/1,200.79
  6. Step 6: Final answer
    x = 567.78

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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.