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Finding the Fourth Proportional to 1,200.28, 1,800.78 and 551.56

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Solution

The fourth proportional to 1,200.28, 1,800.78 and 551.56 is: 827.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.28 : 1,800.78 = 551.56 : x
  2. Step 2: Convert to fraction form
    1,200.28/1,800.78 = 551.56/x
  3. Step 3: Cross multiply
    1,200.28x = 1,800.78 × 551.56
  4. Step 4: Simplify right side
    1,200.28x = 993,238.22
  5. Step 5: Solve for x
    x = 993,238.22/1,200.28
  6. Step 6: Final answer
    x = 827.51

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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.