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Finding the Fourth Proportional to 692.36, 955.51 and 393.66

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Solution

The fourth proportional to 692.36, 955.51 and 393.66 is: 543.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.36 : 955.51 = 393.66 : x
  2. Step 2: Convert to fraction form
    692.36/955.51 = 393.66/x
  3. Step 3: Cross multiply
    692.36x = 955.51 × 393.66
  4. Step 4: Simplify right side
    692.36x = 376,146.07
  5. Step 5: Solve for x
    x = 376,146.07/692.36
  6. Step 6: Final answer
    x = 543.28

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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.