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Finding the Fourth Proportional to 1,022, 1,531.94 and 405.44

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Solution

The fourth proportional to 1,022, 1,531.94 and 405.44 is: 607.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,022 : 1,531.94 = 405.44 : x
  2. Step 2: Convert to fraction form
    1,022/1,531.94 = 405.44/x
  3. Step 3: Cross multiply
    1,022x = 1,531.94 × 405.44
  4. Step 4: Simplify right side
    1,022x = 621,109.75
  5. Step 5: Solve for x
    x = 621,109.75/1,022
  6. Step 6: Final answer
    x = 607.74

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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.