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Finding the Fourth Proportional to 404.40, 605.20 and 282.12

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Solution

The fourth proportional to 404.40, 605.20 and 282.12 is: 422.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.40 : 605.20 = 282.12 : x
  2. Step 2: Convert to fraction form
    404.40/605.20 = 282.12/x
  3. Step 3: Cross multiply
    404.40x = 605.20 × 282.12
  4. Step 4: Simplify right side
    404.40x = 170,739.02
  5. Step 5: Solve for x
    x = 170,739.02/404.40
  6. Step 6: Final answer
    x = 422.20

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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.