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Finding the Fourth Proportional to 800.22, 1,199.72 and 280.01

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Solution

The fourth proportional to 800.22, 1,199.72 and 280.01 is: 419.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.22 : 1,199.72 = 280.01 : x
  2. Step 2: Convert to fraction form
    800.22/1,199.72 = 280.01/x
  3. Step 3: Cross multiply
    800.22x = 1,199.72 × 280.01
  4. Step 4: Simplify right side
    800.22x = 335,926.20
  5. Step 5: Solve for x
    x = 335,926.20/800.22
  6. Step 6: Final answer
    x = 419.79

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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.