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Finding the Fourth Proportional to 1,200.12, 1,803.60 and 817.80

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Solution

The fourth proportional to 1,200.12, 1,803.60 and 817.80 is: 1,229.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.12 : 1,803.60 = 817.80 : x
  2. Step 2: Convert to fraction form
    1,200.12/1,803.60 = 817.80/x
  3. Step 3: Cross multiply
    1,200.12x = 1,803.60 × 817.80
  4. Step 4: Simplify right side
    1,200.12x = 1,474,984.08
  5. Step 5: Solve for x
    x = 1,474,984.08/1,200.12
  6. Step 6: Final answer
    x = 1,229.03

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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.