Home / 1,200.20-1,800.45-378.27

Finding the Fourth Proportional to 1,200.20, 1,800.45 and 378.27

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Solution

The fourth proportional to 1,200.20, 1,800.45 and 378.27 is: 567.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.20 : 1,800.45 = 378.27 : x
  2. Step 2: Convert to fraction form
    1,200.20/1,800.45 = 378.27/x
  3. Step 3: Cross multiply
    1,200.20x = 1,800.45 × 378.27
  4. Step 4: Simplify right side
    1,200.20x = 681,056.22
  5. Step 5: Solve for x
    x = 681,056.22/1,200.20
  6. Step 6: Final answer
    x = 567.45

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1.5x scale

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.