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Finding the Fourth Proportional to 692.26, 1,036.94 and 418.20

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Solution

The fourth proportional to 692.26, 1,036.94 and 418.20 is: 626.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.26 : 1,036.94 = 418.20 : x
  2. Step 2: Convert to fraction form
    692.26/1,036.94 = 418.20/x
  3. Step 3: Cross multiply
    692.26x = 1,036.94 × 418.20
  4. Step 4: Simplify right side
    692.26x = 433,646.22
  5. Step 5: Solve for x
    x = 433,646.22/692.26
  6. Step 6: Final answer
    x = 626.43

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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.