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Finding the Fourth Proportional to 692.52, 955.71 and 636.78

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Solution

The fourth proportional to 692.52, 955.71 and 636.78 is: 878.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.52 : 955.71 = 636.78 : x
  2. Step 2: Convert to fraction form
    692.52/955.71 = 636.78/x
  3. Step 3: Cross multiply
    692.52x = 955.71 × 636.78
  4. Step 4: Simplify right side
    692.52x = 608,577.01
  5. Step 5: Solve for x
    x = 608,577.01/692.52
  6. Step 6: Final answer
    x = 878.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.